The human body has six main systems and is a complex machine that is constantly working to keep us alive. Although each system has its own unique jobs to do, they synergize to keep us healthy and active.
The skeletal system is responsible for giving us support, structure, and protection and works together with the muscular system to move our body. Our muscles pull our bones, which allows us to move, jump, and run! The muscular system actually plays an important role in delivering oxygen to our body’s cells. Without the heart, one of our most important muscles, blood wouldn’t be able to travel around our body! Luckily for us, the blood travels through our lungs, where it drops off carbon dioxide and picks up oxygen that our cells are craving. Speaking of craving, did you ever know that the main purpose of our digestive system isn’t just to digest food? It’s job is actually to take nutrients and water out of what we eat and drink and then deliver it to the circulatory system where it gets delivered to the cells in our body. But none of these systems would work without the direction of our nervous system!
Now let’s get right into it with the skeletal system, where you’ll learn how our bones help us move and protect our organs.
The skeletal system has several important jobs to do in our body. It is responsible for creating blood cells, providing our body with support and structure, and enabling us to move. We have several bones that are responsible for protecting our organs like the ribs protect our heart and lungs, and the skull protects our brain! Bones cannot move unless joined together at joints. Ligaments connect our bones together and cartilage prevents them from rubbing together which would be painful! We are so lucky to have strong, powerful, yet moveable bones in our body!
The bones in our body are made up of four distinct layers. Each of these layers has important responsibilities and is vital to our day-to-day life. The outer layer of bone is called compact bone. Compact bone is solid throughout and enables our body to be supported. Compact bone is so dense that surgeon’s need to use a saw to cut through it. The next layer of bone is called spongy bone and it is lightweight and porous, which prevents our bones from getting too heavy, but still be strong. It makes up about 20% of our skeleton, and it’s found mostly in long bones, joints, and in our spine. The center of many bones is filled with a gelatinous substance called bone marrow. Bone marrow is responsible for creating red blood cells and some of our white blood cells. Bone marrow also makes platelets for our circulatory system. In addition, bone marrow stores iron for when our body needs it. We have two different types of bone marrow: yellow and red. We are born with red marrow, but it slowly changes to yellow over time. Finally, the outermost part of bone is covered in periosteum, a thin, fibrous membrane that covers all bones. The membrane is responsible for helping to create new bone in children and does the same when adults sustain an injury. The periosteum is the site at which ligaments, tendons, and muscles attach to bone! It also contains the blood vessels that allow nutrients and oxygen to the get to the bones! Knowing the four layers of bones can help us to understand just how complex our human body really is!
Cartilage is what covers the ends of your bones at a joint. Cartilage is tough but it is also flexible. Healthy cartilage can help you move by letting your bones glide against each other. Cartilage also helps by preventing bones from rubbing directly against each other. To connect our bones together we need ligaments which are a stretchy tissue that connects two bones together to form a joint. Ligaments are tough and fibrous. When a ligament tears it takes a long time to heal and you could even need surgery. Ligaments only connect bone to bone. Over time ligaments start to stretch and grow to be stretchier. There are four different types of joints: Gliding, Hinge, Pivot, and Ball and Socket. Gliding joints allow only gliding motions where the bones glide past one another along any surface of the joint. They are also known as the plane joint or planar joint. Gliding joints are able to do three motions. They are able to do linear motion, gliding motion and circular motion. Another important thing in the human body is the hinge joint. Hinge joints are found where two or more bones meet together. Hinge joints can only move on one axis to extend and flex. The hinge joint allows motion in only one plane. Pivot joints allow only circular movement where one bone rotates round another bone. Pivot joints in your arm allow you to do things like open a jar. The only pivot joints in the human body are the elbows and where your neck and skull meet. A ball and socket joint is where the round end of the bone fits into a bowl shaped end of another bone. Ball and socket joints allow circular motion in every direction. The shoulder and hip are the only ball and socket joints in the human bod.
As you can see, the skeletal system has many important jobs to do! It allows us to stand straight up, move our body around, and protect our most important organs. However the skeletal system can't move our body by itself. it needs the help of our muscular system as well.
Have you ever wondered what helps move everything in your body during your everyday life? It is your muscular system! Muscles do everything from pumping your blood through your body to making your body run from class to class! Muscles are a big part of our body that let us move. Without them we would not even be able to lift a finger. We should be so thankful and proud that we have such wonderful muscles!
Our Body has two groups of muscles. The two groups are called voluntary and involuntary. In the voluntary system you can control what the muscles do. Most of the voluntary muscles move our bones around because our bones cannot move by themselves. For example, If you ever walk, run or do any type of active movement that involves your bones, your voluntary muscles move your bones. Skeletal muscle is a tissue that is attached to your bones. The tissue has lots of fibers and it looks like a mixture of dark and light bands that are all bundled together, also they run together. In addition the muscles are responsible for contracting and relaxing when a human moves. When muscles move bones they contract and relax in pairs. When one muscle contracts and gets shorter, the other one gets longer as it relaxes. The brain tells the muscles to do this over and over when you want to move. Bones and muscles are attached to tendons. The force off the muscles when they get shorter and longer goes to the tendons and then moves the bones.
Involuntary Muscles can’t be controlled. The heart muscle or cardiac muscle is a very special type of tissue. It is found only in the heart and is responsible for pumping blood throughout our body. The heart beats all the time. Smooth muscles are another kind of involuntary muscle. It is found in layers where there is one sheet of muscle behind another. In the stomach are smooth muscles which push food through the digestive system. They can also push food back up. When you are sick and throw up, it is smooth muscle that is pushing the food out.
All movement in your body is controlled by more than 650 muscles. You can’t move without your voluntary muscles. You wouldn’t be alive without your involuntary muscles. Now you know how important your muscles are so take good care of them!
Have you ever wondered what transports materials around your body? Well, that is the circulatory system! The circulatory system is responsible for moving nutrients, water, and oxygen around your body. Its an amazing way to move everything you need around your body!
The blood in the circulatory delivers nutrients and oxygen to all the cells. Without our blood we would have no way to keep warm or cool off. We would also not be able to fight off infections. White blood cells are small cells that are floating in your blood. They are the ones who fight off all the little germs. White blood cells are the ones who keep you healthy. Did you know that there is another kind of cell? Red cells have a very important job. Their job is to carry oxygen and deliver it throughout your body. The red blood cells first have to get their oxygen. Then once they have oxygen, the red blood cells can deliver it throughout our bodies. Next is platelets. Floating around in your blood are little tiny cells called platelets. When you get cut the little platelets floating in your blood find the blood and clot it. Which means that some of your platelets stick together to plug the cut. Another thing that is in your blood is plasma. Plasma is clear, pale, yellow and carries all the blood cellsl, and chemicals like hormones and glucose. Plasma is also half of you blood.
To get all of your blood to the tips of your fingers and back you have blood vessels that run all the way to the edges of you. Blood vessels branch out like a tree. They start out large but as they branch they get thinner and thinner. When they branch instead of them just stopping at the tip they turn around and go back to your heart to do the same thing again. There are also your arteries. Your arteries are usually red and they carry blood away from the heart inside of your blood vessels. Arteries are very strong and they have three layers that can help pump our heart. Arteries contain oxygen so they drop of at destinations around your body and lose the oxygen then go back around again to get more. In addition are the veins. veins transport blood back to the heart. They are blue and are tube shaped. The blood in your veins do not contain any oxygen because it has already dropped of its oxygen around your body.
Next is the heart. The heart is as equally important as anything else. Probably the most important. Your heart is a muscle that rest in your ribcage. Your ribcage protects your heart. The heart is like a pump but instead of pumping air it pumps blood. Your body tells your heart how much blood to pump and when to. When you are sitting or asleep you won’t need as much oxygen. Your heart contains four chambers. It has two atria and two ventricles. It has the left atrium, left ventricle, right atrium, and right ventricle. The left atrium gets good blood and pumps it to the left ventricle. The left ventricle pumps the good blood from the left atrium to the body. The right atrium gets the poor blood from the body and pumps it to the right ventricle. Then when the right ventricle gets the poor blood it pumps it to the lungs to become good then the whole system starts over again.
Now that you know all about the circulatory system you know how important it is to take care of it. And now you know what keeps you alive and moving everyday, your heart! And to get all the oxygen that you breath into your body it brought around by your circulatory system!
The main part of the respiratory system is to supply the blood with oxygen so it can get to the rest of our body. The respiratory system lets oxygen to be exchanged for carbon dioxide. The meaning of this is so that we get the bad stuff out of our body and good stuff into it.
To get the air into the body it has to go through the open mouth or open nose. When it goes through the open mouth it travels down the trachea, into the lungs, then into the bloodstream. If the oxygen goes through the nasal passage goes through the nose tiny hairs in your nose trap all the mucus and particles that are not good for your body. The tiny hairs keep germs from coming through that airway. When the air gets into the body the epiglottis is a flap that blocks the windpipe when you swallow food or any liquid. The larynx is also known as the voice box. The larynx holds the vocal cords and is responsible for making sound. Inside of the larynx is the vocal cords. There are two vocal cords, these cords vibrate to project sound. The vocal cords form a “V”. The voice box contains the vocal cords and it helps produce the sound that the vocal cords make. Next is the trachea, the trachea is the right name for the windpipe. It takes air from your mouth and nose and starts into your neck then it splits up into two bronchi.
Have you ever wondered how the air moves in the lungs? It starts by going through the mouth or nose. The oxygen travels down the back of the throat, then into the trachea or the windpipe. Your trachea then divides into small tubes called the bronchial tubes. Next is your lungs, your lungs make up one of the biggest organs in your body. The lungs work with the respiratory system to get fresh air into your body. Bronchial tubes are a tube that allows humans to exchange the air in their lungs. These tubes connect the lungs to the trachea to complete this process. In addition, Bronchi is the main passage into the lungs. When someone takes a breath through the nose or the mouth it travels down the larynx. Now the bronchioles are the small tubes that branch out like a tree once it travels down the trachea and the esophagus. Next is the alveoli/alveolus. There are lots of alveoli in the body. The last thing is exchange of gases. Exchange of gases are when oxygen gets to the bloodstream and when carbon dioxide gets out of our bloodstream.
And now that is all the responsibilities and things that the respiratory system does.
The purpose of the digestive system is to break down foods into small molecules that is soon absorbed into the body. The digestive system changes the food that we eat. It makes the food into the kind of nutrients that our bodies need.
The mouth is a big cavity in our body it lets air in and out of our body. The mouth contains lots of organs like teeth, tongue, and salivary glands. All of these organs work together to help digestion. In the mouth there are teeth. The teeth chop the food up into smaller pieces so that it is easier to digest them. Also iin the mouth is saliva. The saliva helps break down the food into small particles. Next it the tongue, the tongue is a group of muscles that are in one big place. All of these muscles are in different directions so that it can do all the tongues jobs. When you are ready to swallow the tongue pushes a little bit of bolus which is mushed-up food down the back of your throat towards you esophagus. The esophagus is a long tube that runs down the back of your throat to your stomach.
Peristalsis is the beginning step of digestion. Peristalsis is when the muscles that line your esophagus push the food down your esophagus to you stomach. (Reverse peristalsis is when the muscles push backup your throat. also known as throwing up.) Stomach, the stomach is like a stretchy bag that holds food. It expands when you eat more food. The stomach when it has the food in it acts like a blender it shakes up the food into smaller pieces so that it can go through the small intestine. In the stomach there is a lining on the inside that protects your stomach from things that could make you sick. The lining is also known mucous. In the stomach there are liquids or acids that help break down your digestion. The first liquid is digestive juices. Digestive juices is a juices that is mixed with many other things to make digestion break down in the stomach easier. Now that all of the mixing is done and the food is broken down it is called chyme. Chyme is a mass of food that is partly digested and then it is forced into the small intestine.
The small intestine is a a long tube that is below the stomach. The small intestines job is to break down the food even more so that your body can absorb all of the nutrients it needs. The inside wall of the small intestine is covered with finger like shapes called villi. The villi is the part of the small intestine which absorbs the nutrients. Large intestine is much bigger than the small intestine. The large intestine is almost the last stop to digestion. The large intestines main job is to absorb water from the undigested matter so that it can leave the body in a solid form. Behind the stomach is the pancreas, the pancreas makes juices that helps the body digest fats and proteins. Pancreatic enzymes are the ones that are the most help to digesting fats and proteins. Next is the gallbladder, the gallbladder is like a warehouse that holds bile until the body needs it. Bile is a juice from the liver. Bile helps absorb nutrients in the bloodstream. When the Large intestine has absorbed all of the water it can leave the body through the anus.
We need the digestive system to take the food we eat and change it into what our bodies need. After changing the food into nutrients, the digestive system then makes sure the nutrients are delivered to every cell in our body.
The nervous system is the system that controls everything you do. It controls things like breathing, walking, thinking, and feeling. The nervous system is made up of the brain, spinal cord, and all of the nerves that make up your body.
The brain is the boss of the whole body it controls everything. It even controls things when your sleeping. There are three different parts of the brain. These three parts of the brain are called cerebrum, cerebellum, and medulla. The cerebrum is the biggest part of the brain, it takes up more space than any other part of the brain. The cerebrums is the thinking part of the brain. It controls the voluntary muscles, so that you can run, dance, and walk. Without your cerebrum your voluntary muscles would not exist because we would have nothing to control them. Next is your cerebellum, your cerebellum controls you balance, coordination, and movement. But your cerebellum is much smaller than the cerebellum. because of your cerebellum you can stand up straight, keep your balance, and move around. The cerebellum is also located in the back of the brain. The last part of the brain was the medulla, the medulla is also known as the brainstem. The medulla is located underneath the cerebrum. It connects the rest of the brain to the spinal cord. The medulla is in charge of the functions your body needs to stay alive and healthy. It controls things like breathing air and digesting food.
Nerves, nerves are responsible for carrying messages around your body that come for your brain. If you want to walk or run your nerves will tell your legs to run or walk. There are many different type of nerves. One out of the many nerves are called sensory nerves. Sensory nerves carry sensory receptors to the spinal cord and the brain. Next are the motor nerves, the motor nerves carry the signals to a part of the spinal cord that makes the reaction happen. Spinal cord, the spinal cord is a really long tissue of nerves. The spinal cord goes from the bottom of your brain the your lower back then branches out so it can reach your whole body. A neuron is a cell that is similar to lots of other cells and can be different in many ways. All of these nerves have synapses, dendrites, and axons. Synapses let information flow from neuron to another through a synapses. A dendrites bring electrical signals to the body. Axons take information away from the cells.
The nervous system of course is the boss of the show, it runs everything from thinking to balancing on your feet. The Nervous system has very important jobs like carrying all of your feelings and nerves throughout your body. The nervous system is of course very very important for our bodys!
As you can see, the human body is a complicated, unique machine that does so many important things. Not only does it help you live, but it also helps you move, think, breathe, feel, and communicate! Can you possibly imagine what life would be like if we were missing even one of these important systems? If not, maybe a few of these valuable concepts will help you understand better:
Now you have read all about our human body and how it works 24/7 for us. I hope that you learned a lot and that you can apply some of this information to your everyday life.
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The skeletal system is responsible for giving us support, structure, and protection and works together with the muscular system to move our body. Our muscles pull our bones, which allows us to move, jump, and run! The muscular system actually plays an important role in delivering oxygen to our body’s cells. Without the heart, one of our most important muscles, blood wouldn’t be able to travel around our body! Luckily for us, the blood travels through our lungs, where it drops off carbon dioxide and picks up oxygen that our cells are craving. Speaking of craving, did you ever know that the main purpose of our digestive system isn’t just to digest food? It’s job is actually to take nutrients and water out of what we eat and drink and then deliver it to the circulatory system where it gets delivered to the cells in our body. But none of these systems would work without the direction of our nervous system!
Now let’s get right into it with the skeletal system, where you’ll learn how our bones help us move and protect our organs.
The skeletal system has several important jobs to do in our body. It is responsible for creating blood cells, providing our body with support and structure, and enabling us to move. We have several bones that are responsible for protecting our organs like the ribs protect our heart and lungs, and the skull protects our brain! Bones cannot move unless joined together at joints. Ligaments connect our bones together and cartilage prevents them from rubbing together which would be painful! We are so lucky to have strong, powerful, yet moveable bones in our body!
The bones in our body are made up of four distinct layers. Each of these layers has important responsibilities and is vital to our day-to-day life. The outer layer of bone is called compact bone. Compact bone is solid throughout and enables our body to be supported. Compact bone is so dense that surgeon’s need to use a saw to cut through it. The next layer of bone is called spongy bone and it is lightweight and porous, which prevents our bones from getting too heavy, but still be strong. It makes up about 20% of our skeleton, and it’s found mostly in long bones, joints, and in our spine. The center of many bones is filled with a gelatinous substance called bone marrow. Bone marrow is responsible for creating red blood cells and some of our white blood cells. Bone marrow also makes platelets for our circulatory system. In addition, bone marrow stores iron for when our body needs it. We have two different types of bone marrow: yellow and red. We are born with red marrow, but it slowly changes to yellow over time. Finally, the outermost part of bone is covered in periosteum, a thin, fibrous membrane that covers all bones. The membrane is responsible for helping to create new bone in children and does the same when adults sustain an injury. The periosteum is the site at which ligaments, tendons, and muscles attach to bone! It also contains the blood vessels that allow nutrients and oxygen to the get to the bones! Knowing the four layers of bones can help us to understand just how complex our human body really is!
Cartilage is what covers the ends of your bones at a joint. Cartilage is tough but it is also flexible. Healthy cartilage can help you move by letting your bones glide against each other. Cartilage also helps by preventing bones from rubbing directly against each other. To connect our bones together we need ligaments which are a stretchy tissue that connects two bones together to form a joint. Ligaments are tough and fibrous. When a ligament tears it takes a long time to heal and you could even need surgery. Ligaments only connect bone to bone. Over time ligaments start to stretch and grow to be stretchier. There are four different types of joints: Gliding, Hinge, Pivot, and Ball and Socket. Gliding joints allow only gliding motions where the bones glide past one another along any surface of the joint. They are also known as the plane joint or planar joint. Gliding joints are able to do three motions. They are able to do linear motion, gliding motion and circular motion. Another important thing in the human body is the hinge joint. Hinge joints are found where two or more bones meet together. Hinge joints can only move on one axis to extend and flex. The hinge joint allows motion in only one plane. Pivot joints allow only circular movement where one bone rotates round another bone. Pivot joints in your arm allow you to do things like open a jar. The only pivot joints in the human body are the elbows and where your neck and skull meet. A ball and socket joint is where the round end of the bone fits into a bowl shaped end of another bone. Ball and socket joints allow circular motion in every direction. The shoulder and hip are the only ball and socket joints in the human bod.
As you can see, the skeletal system has many important jobs to do! It allows us to stand straight up, move our body around, and protect our most important organs. However the skeletal system can't move our body by itself. it needs the help of our muscular system as well.
Have you ever wondered what helps move everything in your body during your everyday life? It is your muscular system! Muscles do everything from pumping your blood through your body to making your body run from class to class! Muscles are a big part of our body that let us move. Without them we would not even be able to lift a finger. We should be so thankful and proud that we have such wonderful muscles!
Our Body has two groups of muscles. The two groups are called voluntary and involuntary. In the voluntary system you can control what the muscles do. Most of the voluntary muscles move our bones around because our bones cannot move by themselves. For example, If you ever walk, run or do any type of active movement that involves your bones, your voluntary muscles move your bones. Skeletal muscle is a tissue that is attached to your bones. The tissue has lots of fibers and it looks like a mixture of dark and light bands that are all bundled together, also they run together. In addition the muscles are responsible for contracting and relaxing when a human moves. When muscles move bones they contract and relax in pairs. When one muscle contracts and gets shorter, the other one gets longer as it relaxes. The brain tells the muscles to do this over and over when you want to move. Bones and muscles are attached to tendons. The force off the muscles when they get shorter and longer goes to the tendons and then moves the bones.
Involuntary Muscles can’t be controlled. The heart muscle or cardiac muscle is a very special type of tissue. It is found only in the heart and is responsible for pumping blood throughout our body. The heart beats all the time. Smooth muscles are another kind of involuntary muscle. It is found in layers where there is one sheet of muscle behind another. In the stomach are smooth muscles which push food through the digestive system. They can also push food back up. When you are sick and throw up, it is smooth muscle that is pushing the food out.
All movement in your body is controlled by more than 650 muscles. You can’t move without your voluntary muscles. You wouldn’t be alive without your involuntary muscles. Now you know how important your muscles are so take good care of them!
Have you ever wondered what transports materials around your body? Well, that is the circulatory system! The circulatory system is responsible for moving nutrients, water, and oxygen around your body. Its an amazing way to move everything you need around your body!
The blood in the circulatory delivers nutrients and oxygen to all the cells. Without our blood we would have no way to keep warm or cool off. We would also not be able to fight off infections. White blood cells are small cells that are floating in your blood. They are the ones who fight off all the little germs. White blood cells are the ones who keep you healthy. Did you know that there is another kind of cell? Red cells have a very important job. Their job is to carry oxygen and deliver it throughout your body. The red blood cells first have to get their oxygen. Then once they have oxygen, the red blood cells can deliver it throughout our bodies. Next is platelets. Floating around in your blood are little tiny cells called platelets. When you get cut the little platelets floating in your blood find the blood and clot it. Which means that some of your platelets stick together to plug the cut. Another thing that is in your blood is plasma. Plasma is clear, pale, yellow and carries all the blood cellsl, and chemicals like hormones and glucose. Plasma is also half of you blood.
To get all of your blood to the tips of your fingers and back you have blood vessels that run all the way to the edges of you. Blood vessels branch out like a tree. They start out large but as they branch they get thinner and thinner. When they branch instead of them just stopping at the tip they turn around and go back to your heart to do the same thing again. There are also your arteries. Your arteries are usually red and they carry blood away from the heart inside of your blood vessels. Arteries are very strong and they have three layers that can help pump our heart. Arteries contain oxygen so they drop of at destinations around your body and lose the oxygen then go back around again to get more. In addition are the veins. veins transport blood back to the heart. They are blue and are tube shaped. The blood in your veins do not contain any oxygen because it has already dropped of its oxygen around your body.
Next is the heart. The heart is as equally important as anything else. Probably the most important. Your heart is a muscle that rest in your ribcage. Your ribcage protects your heart. The heart is like a pump but instead of pumping air it pumps blood. Your body tells your heart how much blood to pump and when to. When you are sitting or asleep you won’t need as much oxygen. Your heart contains four chambers. It has two atria and two ventricles. It has the left atrium, left ventricle, right atrium, and right ventricle. The left atrium gets good blood and pumps it to the left ventricle. The left ventricle pumps the good blood from the left atrium to the body. The right atrium gets the poor blood from the body and pumps it to the right ventricle. Then when the right ventricle gets the poor blood it pumps it to the lungs to become good then the whole system starts over again.
Now that you know all about the circulatory system you know how important it is to take care of it. And now you know what keeps you alive and moving everyday, your heart! And to get all the oxygen that you breath into your body it brought around by your circulatory system!
The main part of the respiratory system is to supply the blood with oxygen so it can get to the rest of our body. The respiratory system lets oxygen to be exchanged for carbon dioxide. The meaning of this is so that we get the bad stuff out of our body and good stuff into it.
To get the air into the body it has to go through the open mouth or open nose. When it goes through the open mouth it travels down the trachea, into the lungs, then into the bloodstream. If the oxygen goes through the nasal passage goes through the nose tiny hairs in your nose trap all the mucus and particles that are not good for your body. The tiny hairs keep germs from coming through that airway. When the air gets into the body the epiglottis is a flap that blocks the windpipe when you swallow food or any liquid. The larynx is also known as the voice box. The larynx holds the vocal cords and is responsible for making sound. Inside of the larynx is the vocal cords. There are two vocal cords, these cords vibrate to project sound. The vocal cords form a “V”. The voice box contains the vocal cords and it helps produce the sound that the vocal cords make. Next is the trachea, the trachea is the right name for the windpipe. It takes air from your mouth and nose and starts into your neck then it splits up into two bronchi.
Have you ever wondered how the air moves in the lungs? It starts by going through the mouth or nose. The oxygen travels down the back of the throat, then into the trachea or the windpipe. Your trachea then divides into small tubes called the bronchial tubes. Next is your lungs, your lungs make up one of the biggest organs in your body. The lungs work with the respiratory system to get fresh air into your body. Bronchial tubes are a tube that allows humans to exchange the air in their lungs. These tubes connect the lungs to the trachea to complete this process. In addition, Bronchi is the main passage into the lungs. When someone takes a breath through the nose or the mouth it travels down the larynx. Now the bronchioles are the small tubes that branch out like a tree once it travels down the trachea and the esophagus. Next is the alveoli/alveolus. There are lots of alveoli in the body. The last thing is exchange of gases. Exchange of gases are when oxygen gets to the bloodstream and when carbon dioxide gets out of our bloodstream.
And now that is all the responsibilities and things that the respiratory system does.
The purpose of the digestive system is to break down foods into small molecules that is soon absorbed into the body. The digestive system changes the food that we eat. It makes the food into the kind of nutrients that our bodies need.
The mouth is a big cavity in our body it lets air in and out of our body. The mouth contains lots of organs like teeth, tongue, and salivary glands. All of these organs work together to help digestion. In the mouth there are teeth. The teeth chop the food up into smaller pieces so that it is easier to digest them. Also iin the mouth is saliva. The saliva helps break down the food into small particles. Next it the tongue, the tongue is a group of muscles that are in one big place. All of these muscles are in different directions so that it can do all the tongues jobs. When you are ready to swallow the tongue pushes a little bit of bolus which is mushed-up food down the back of your throat towards you esophagus. The esophagus is a long tube that runs down the back of your throat to your stomach.
Peristalsis is the beginning step of digestion. Peristalsis is when the muscles that line your esophagus push the food down your esophagus to you stomach. (Reverse peristalsis is when the muscles push backup your throat. also known as throwing up.) Stomach, the stomach is like a stretchy bag that holds food. It expands when you eat more food. The stomach when it has the food in it acts like a blender it shakes up the food into smaller pieces so that it can go through the small intestine. In the stomach there is a lining on the inside that protects your stomach from things that could make you sick. The lining is also known mucous. In the stomach there are liquids or acids that help break down your digestion. The first liquid is digestive juices. Digestive juices is a juices that is mixed with many other things to make digestion break down in the stomach easier. Now that all of the mixing is done and the food is broken down it is called chyme. Chyme is a mass of food that is partly digested and then it is forced into the small intestine.
The small intestine is a a long tube that is below the stomach. The small intestines job is to break down the food even more so that your body can absorb all of the nutrients it needs. The inside wall of the small intestine is covered with finger like shapes called villi. The villi is the part of the small intestine which absorbs the nutrients. Large intestine is much bigger than the small intestine. The large intestine is almost the last stop to digestion. The large intestines main job is to absorb water from the undigested matter so that it can leave the body in a solid form. Behind the stomach is the pancreas, the pancreas makes juices that helps the body digest fats and proteins. Pancreatic enzymes are the ones that are the most help to digesting fats and proteins. Next is the gallbladder, the gallbladder is like a warehouse that holds bile until the body needs it. Bile is a juice from the liver. Bile helps absorb nutrients in the bloodstream. When the Large intestine has absorbed all of the water it can leave the body through the anus.
We need the digestive system to take the food we eat and change it into what our bodies need. After changing the food into nutrients, the digestive system then makes sure the nutrients are delivered to every cell in our body.
The nervous system is the system that controls everything you do. It controls things like breathing, walking, thinking, and feeling. The nervous system is made up of the brain, spinal cord, and all of the nerves that make up your body.
The brain is the boss of the whole body it controls everything. It even controls things when your sleeping. There are three different parts of the brain. These three parts of the brain are called cerebrum, cerebellum, and medulla. The cerebrum is the biggest part of the brain, it takes up more space than any other part of the brain. The cerebrums is the thinking part of the brain. It controls the voluntary muscles, so that you can run, dance, and walk. Without your cerebrum your voluntary muscles would not exist because we would have nothing to control them. Next is your cerebellum, your cerebellum controls you balance, coordination, and movement. But your cerebellum is much smaller than the cerebellum. because of your cerebellum you can stand up straight, keep your balance, and move around. The cerebellum is also located in the back of the brain. The last part of the brain was the medulla, the medulla is also known as the brainstem. The medulla is located underneath the cerebrum. It connects the rest of the brain to the spinal cord. The medulla is in charge of the functions your body needs to stay alive and healthy. It controls things like breathing air and digesting food.
Nerves, nerves are responsible for carrying messages around your body that come for your brain. If you want to walk or run your nerves will tell your legs to run or walk. There are many different type of nerves. One out of the many nerves are called sensory nerves. Sensory nerves carry sensory receptors to the spinal cord and the brain. Next are the motor nerves, the motor nerves carry the signals to a part of the spinal cord that makes the reaction happen. Spinal cord, the spinal cord is a really long tissue of nerves. The spinal cord goes from the bottom of your brain the your lower back then branches out so it can reach your whole body. A neuron is a cell that is similar to lots of other cells and can be different in many ways. All of these nerves have synapses, dendrites, and axons. Synapses let information flow from neuron to another through a synapses. A dendrites bring electrical signals to the body. Axons take information away from the cells.
The nervous system of course is the boss of the show, it runs everything from thinking to balancing on your feet. The Nervous system has very important jobs like carrying all of your feelings and nerves throughout your body. The nervous system is of course very very important for our bodys!
As you can see, the human body is a complicated, unique machine that does so many important things. Not only does it help you live, but it also helps you move, think, breathe, feel, and communicate! Can you possibly imagine what life would be like if we were missing even one of these important systems? If not, maybe a few of these valuable concepts will help you understand better:
- The bones in our body support and protect, while our muscles pull but never push!
- In addition, our blood delivers oxygen and nutrients to our cells, while the alveoli in our lungs exchange carbon dioxide for oxygen.
- Finally, our digestive system is responsible for extracting important nutrients and water from what we eat and drink, but we’d never be able to do any of these things without our amazing nervous system!
Now you have read all about our human body and how it works 24/7 for us. I hope that you learned a lot and that you can apply some of this information to your everyday life.
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1. What writing skills did you improve while working on your Human Body Research Paper? Explain. 2. What are some concepts that you learned about the human body during this unit that you think are important (not just interesting)? 3. What was the most challenging part of writing your Human Body Research Paper? Why? 4. What aspect of the Human Body Research Paper are you most proud of? Why? | 1. The writing skill I improved on was revising my writing. I improved on it by after I finished the whole paper I read over it again and fixed lots of things. 2. A concept that I learned about that I thought was important was learning about how your digestive system works. 3. The most challenging part of writing my paper was getting the paragraphs done on time. It was challenging because I had other homework and I was not focused during class time. 4. I was most proud of my digestive system because it was the first paragraph we had to write by ourselves and I thought I did good for my first time. |