SAT Subject Biology Practice Question 287: Answer and Explanation

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Question: 287

17. Which of the following are functions of the kidney?

I. filtration of blood to remove wastes

II. blood pressure regulation

III. pH regulation

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

Correct Answer: E

Explanation:

E The kidney's primary role is to filter blood to remove wastes (statement I is true, and choice D is eliminated), but it is also involved to a fair extent in blood pressure regulation (through renin and aldosterone, so II is true and choices A and C are eliminated) and in pH regulation (through excretion of hydrogen ions, so III is true and choice B is eliminated).

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