The defecation reflex
A. constricts the internal anal sphincter.
B. is stimulated by distention of the rectum.
C. lasts several hours.
D. inhibits further peristalsis in the rectum and lower colon.
E. None of the choices are correct.
Answer: B
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a. sclera. b. cornea c. blind spot. d. lens. e. iris.
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