- iris: the colored part of the eye.
- pupil: the dark circle in the center of the eye. The pupil is an opening that lets light enter the eye.
- reflex: a quick, unplanned response.
Reflexes are our bodies' built in actions that happen quickly without having to think about them. They are important because they can keep us out of trouble and prevent us from harm.
Pupil dilation is a common reflex.
The Blink Reflex is an attempt to protect our eyes from things that might damage them.
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Complete the experiment found here: http://sd25.sciencecompanionprime.com/tutti/content/activity/launchViewer.svc?activityId=2B92F1BADDD742F7BFA4F98F926F2A89&reviewUserId=&getUserData=1&doSave=1&readOnly=0
Use an iPad to take a very short video of this activity. Upload it to YouTube. Embed it on this blog entry.
Take screen shots of all of the questions and answers & put them on a blog entry entitled, "Moving Quickly to Prevent Harm." Please put "Lightbox" on each.
Then answer these questions as well:
1. Can you feel it when your pupils dilate?
2. Do you have any control over your pupils when they dilate?
3. What do we call this when a reflex happens without our control?
4. Why do our pupils get bigger in the dark and smaller in the light?
5. How does this reflex protect our eyes?