SAT Subject Biology Practice Question 287: Answer and Explanation
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
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).