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.

Muscles and nerve fibers allow a person to move their body and enable the internal organs to function. There are more than 600 muscles in the human body. People also have different types of muscle. A ...

Edith Cowan University provides funding as a member of The Conversation AU. Université Clermont Auvergne provides funding as a member of The Conversation FR. Most of us know children who can run and ...