5th Graders explored muscles outside their body today!
We learned that muscles operate in teams to move our bones. The brain sends a signal for one muscle to contract (shorten) and at the same time quits sending signals to its teammate (causing it to relax or extend.)
This image from http://www.dynamicscience.com shows the biceps (the inside muscle) contracting while the opposite triceps muscle is relaxed (or extended.) It also shows that when the triceps contracts the biceps is relaxes.
We built our own arm and labeled the muscles (balloons) and bones (tubes.) We even gave it a hinge joint (brads) to bend. Instead of using nerve signals, however, we had to do the bending with our real arms!
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| Nice pink contracted biceps, and blue extended triceps! |
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| Extended biceps, contracted triceps! |
Can you label this diagram with the following words?
- Biceps
- Triceps
- Humerus
- Radius
- Ulna
- Tendon
- Carpels
- Phalange
- Hinge Joint
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