The Defecation Reflex

question 23

Multiple Choice

The defecation reflex

• A)is initiated when mass movements force fecal material into the rectum, stimulating stretch receptors in the rectal wall
• B)involves relaxation of the internal anal sphincter
• C)involves contraction of the sigmoid colon and rectum
• D)can be overridden by voluntary contraction of the external anal sphincter
• E)has all of the above characteristics

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