Anus is surrounded by _____ types of muscles?
Correct answer: A. 2
- A. 2
- B. 3
- C. 1
- D. 4
Explanation
The anus is controlled by two sphincters: an internal sphincter made of involuntary smooth muscle and an external sphincter made of voluntary skeletal muscle. The likely mistake is one, which ignores that the two sphincters have different muscle types and control mechanisms.
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