What is sphincter???? +
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spihinter is a ring of muscle surrounding and serving to guard or close an opening or tube, such as the anus or the openings of the stomach.
he sphincter muscles act as a valve to control the flow of partially digested food from stomach to the small intestine.
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Sphincter is a ring of muscle that surrounds an opening in the body and that can become tighter in order to close the opening......!!
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