In order for blood to enter the heart,
A) the pressure in the atria must be lower than in the veins.
B) the atria must be in diastole.
C) the atria must not only be at rest but the atrial pressure must be lower than the veins.
D) the AV valves must be open.
E) All of the answers are correct.
C) the atria must not only be at rest but the atrial pressure must be lower than the veins.
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