When you hop, run or jump, your legs behave like springs, absorbing and returning energy with each step. But what happens to ...

Muscles are attached to bones by tendons. Muscles contract to move our ... control the flexion of the elbow so the body is lowered under control down towards the floor. The triceps are the antagonist.

Muscles can only contract and relax, so they always work in pairs called antagonistic muscles. Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend. Skeletal ...