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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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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