Which of the following happens during atrial systole?
A) The atria depolarize and contract together creating decreased volume and higher pressure in the atria than the ventricles.
B) The atria then repolarize and relax.
C) Blood rushes in from the vena cavae and pulmonary veins to fill the right and left atria.
D) The increased pressure pushes blood through the AV valves into the atria.
Correct Answer:
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