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.
In her book, “On Muscle: The Stuff That Moves Us and Why it Matters," journalist and author Bonnie Tsui explores the biology and beauty of muscles. (Drawing by Bonnie Tsui) For a long time, ...
The muscular system consists of various types of muscle that each play a crucial role in the function of the body. Some muscular system functions include mobility, stability, posture, and circulation.
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