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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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dontstealmypeng dontstealmypeng
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7 years ago
A.The internal anal sphincter relaxes under sympathetic stimulus.
B.The sigmoid colon and rectum muscles contract with sympathetic stimulation.
C.The external anal sphincter under conscious (voluntary) control does not receive a brain signal to relax.
D.The levator ani muscle contracts when it receives parasympathetic stimulation.
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#1
Educator
7 years ago
During stress response, the external anal sphincter under the voluntary control does not receive the signal reflex that leads to the urge to defecate.

Hence, the correct option is (C).
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