Which statement concerning defecation reflex is NOT correct?
A) It is initiated when mass movements force fecal material into the rectum, stimulating stretch receptors in the rectal wall.
B) It involves relaxation of the internal anal sphincter and contraction of the sigmoid colon and rectum.
C) It cannot be overridden by voluntary contraction of the external anal sphincter.
D) a and b
Correct Answer:
Verified
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