SAT Subject Biology Practice Question 107: Answer and Explanation

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Question: 107

17. Which of the following shows the proper order of blood flow through the heart, entering from the vena cava?

A. Left atrium → left ventricle → right ventricle → right atrium
B. Left ventricle → left atrium → right atrium → right ventricle
C. Right atrium → right ventricle → left atrium → left ventricle
D. Right ventricle → right atrium → left atrium → left ventricle
E. Right ventricle → right atrium → left ventricle → left atrium

Correct Answer: C

Explanation:

Deoxygenated blood enters the heart from the rest of the body via the anterior vena cava and then enters the right atrium. From there, blood is pumped into the right ventricle and into the lungs to become reoxygenated. Reoxygenated blood is then pumped into the left atrium from the lungs and into the left ventricle, where it is then pumped out into the rest of the body via the aorta.

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