The film explores the muscular system of the human body, detailing the roles and functions of the three types of muscles: skeletal, smooth, and cardiac. Skeletal muscles, which are voluntary and work ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

When you think about muscles, you probably think about the ones in your arms, legs, back or abs. However, muscles do far more than move the body. A muscle is a type of tissue, a group of cells that ...