individual muscle fibers exist, collectively called slow-twitch and fast-twitch, and these fibers are all organized into motor units. “There are three types of muscle fibers,” explains Dave ...

Isotonic contractions – these occur when a muscle contracts and changes length and there are two types: Isotonic concentric contraction – this involves the muscle shortening. The origin and ...

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 ...