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A muscle that is the primary actor in a given movement, that is, the muscle that produces the movement in muscle contraction.
also called sphincters; open and close to guard entrances of body; ex: orbicularis oris muscle of the mouth
the muscle fibers are based over a broad area, but all fibers come together at a common attachment site.
the fascicles are parallel to the long axis of the muscle. Most of the muscles in the body are parallel muscles.
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