AP Biology : Circulatory Anatomy

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #31 : Circulatory Anatomy

In the heart, blood is oxygen-rich in the __________, and oxygen-poor in the __________.

Possible Answers:

left ventricle . . . aorta

left atrium . . . right atrium and right ventricle

superior vena cava . . . right ventricle 

right atrium . . . left ventricle

pulmonary arteries . . . pulmonary veins

Correct answer:

left atrium . . . right atrium and right ventricle

Explanation:

Blood is oxygenated in the lungs and pumped through the pulmonary veins to the left atrium of the heart. The blood is then pumped to the left ventricle, which pumps the oxygen-rich blood throughout the body. The oxygen-poor blood returns to the heart by entering the right atrium, and remains oxygen poor as it is pumped into the right ventricle and through the pulmonary arteries until it is oxygenated again in the lungs.

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