Blood enters the heart because of......

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(A) Blood enters the heart from the veins into the atria due to atrial diastole (relaxation of the atria). During atrial diastole,the pressure in the

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Atrial diastole

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(A) Blood enters the heart from the veins into the atria due to atrial diastole (relaxation of the atria). During atrial diastole,the pressure in the atria decreases,creating a suction effect that draws blood from the vena cava and pulmonary veins into the right and left atria,respectively. Therefore,the correct answer is $A$.

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