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News in Physiological Sciences, Vol 5, 263-267, Copyright © 1990 by International Union of Physiological Sciences
ARTICLES |
J Krier and T Adams
External anal and urethral sphincters have several common features. Each has striated muscle fibers encircling those of smooth muscle that reflexly contract to guard an orifice or relax to allow evacuation. These functions require special contractile and morphological properties and reflex control not demanded of striated skeletal muscles.
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