The muscular system is the biological system of animals that allows them to move internally and externally. The muscular system in vertebrates consists of three different types of muscles: cardiac[?], skeletal[?] and smooth[?]. Cardiac muscle is a striated muscle[?] that makes up the heart. It is the only type of muscle consisting of branching fibers. Skeletal muscle consists of voluntary muscles[?] attached to the frame of the skeletal system enabling bodily movement. Smooth muscle is the involuntary muscle[?] that enables the movement of internal organs. Movement of all muscles is controlled through the nervous system.
... 20 - B. F. Skinner, behavioral psychologist (+ 1990)
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