- Muscles always work in pairs.
- Muscles never push they only pull or contract.
- One muscle must relax to let the other one pull.
| 1. It was hard when I couldn't talk to my partner. 2. It was fun when we figured out that it worked. 3. When you bend your arm up you are using your bicep to pull with the tendons connected to it. When you are doing that your tricep is relaxing and your bicep is contracting. The cartalige is what makes your humerous and ulna/radius not rub tgether and hurt the bone. |