Muscles have a range of functions from pumping blood and supporting movement to lifting heavy weights or giving birth. Muscles work by either contracting or relaxing to cause movement. This movement may be voluntary (meaning the movement is made consciously) or done without our conscious awareness (involuntary).
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3 days ago · an organ that is essentially a mass of muscle tissue attached at either end to a fixed point and that by contracting moves or checks the ...
Muscle spasms (muscle cramps) are painful contractions and tightening of your muscles. They're common, involuntary and unpredictable.