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Rectoanal inhibitory reflex

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The rectoanal inhibitory reflex (RAIR), also known as the anal sampling mechanism, anal sampling reflex, rectosphincteric reflex, or anorectal sampling reflex, is a reflex characterized by a transient involuntary relaxation of the internal anal sphincter in response to distention of the rectum.[1] The RAIR provides the upper anal canal with the ability to discriminate between flatus and fecal material.