Muscle is a contractile form of tissue. It is one of the four major tissue types, the
other three being epithelium, connective tissue and nervous tissue. Muscle
contraction is used to move parts of the body, as well as to move substances within
the body.
Exercise is often recommended as a means of improving motor skills, fitness and
muscle strength. Exercise has several effects upon muscles, connective tissue and
bone, and the nerves that stimulate the muscles.
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