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Smooth muscle is specialized for slow, prolonged contraction in a wave-like manner, producing peristaltic movements as in the gastrointestinal tract and the male genital tract, or it may contract throughout producing extrusive movements as in the urinary bladder, the gall bladder and the uterus. Smooth muscle has spontaneous contractile activity.
Figure 29. A suggest model for smooth muscle cell contraction
Figure 30. Skeletal muscle, electron micrograph
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| Organization of a skeletal muscle | | | Nervous tissue |