Which of the following statements regarding blood flow is correct?
A) Ejection fraction is the percentage of blood that the heart pumps per contraction.
B) If more blood returns to the heart, stroke volume decreases and cardiac output falls.
C) As more blood is pumped with each contraction, the ejection fraction increases.
D) The amount of blood that returns to the atrium
Answer: A) Ejection fraction is the percentage of blood that the heart pumps per contraction.
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