SAT Subject Biology Practice Question 291: Answer and Explanation

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Question: 291

1. Which of the following contains blood poor in oxygen?

I. Right ventricle

II. Pulmonary vein

III. Pulmonary artery

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

Correct Answer: E


E Blood that is poor in oxygen returns from the body to the right side of the heart (I is true, so choices B and C are eliminated), then travels through the pulmonary artery (III is true, so choices A and D are eliminated) to get to the lungs, where it picks up oxygen again. This oxygen-rich blood returns to the left side of the heart through the pulmonary vein (II is false) and is pumped back out to the body through the aorta.

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