SAT Subject Biology Practice Question 54: Answer and Explanation

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Question: 54

3. A nerve leading to the small intestine causes the rate of digestion to increase. This nerve MOST LIKELY belongs to which of the following systems and divisions?

I. Autonomic

II. Sympathetic

III. Peripheral

IV. Enteric

A. I and II only
B. II and III only
C. I, II, and III
D. I, III, and IV
E. II, III, and IV

Correct Answer: D

Explanation:

The nerve is outside the CNS and so belongs to the peripheral nervous system (PNS). Because it is not under voluntary control, it must belong to the autonomic system. Because it promotes “rest and digest” functions, it must belong to the parasympathetic (rather than sympathetic) nervous system. Finally, because it innervates the intestines, it is likely part of the enteric nervous system.

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