SAT Subject Biology Practice Question 94: Answer and Explanation

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Question: 94

4. The loop of Henle is a structure within the urinary tract responsible for reabsorbing water. Compared to a terrestrial species, how might this structure appear in a freshwater aquatic species?

A. Absent
B. Longer
C. Shorter
D. Withered
E. Thinner

Correct Answer: C

Explanation:

Freshwater aquatic animals require less ability to reabsorb water than do terrestrial or saltwater species, which require a greater capacity for water reabsorption and thus a longer loop of Henle.

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