In terms of blood flow, why is it important that atrial diastole occurs just as ventricular systole begins?
A. Blood is continually propelled in a forward motion down its pressure gradient.
B. The atria need that time to prepare for the next contraction.
C. Ventricular systole pulls the remaining 20% of blood volume from the atria.
D. Blood would flow too fast otherwise.
Answer: A. Blood is continually propelled in a forward motion down its pressure gradient.
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