During diastole, where does the blood come from into the atria?

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Multiple Choice

During diastole, where does the blood come from into the atria?

Explanation:
During diastole the heart muscles are relaxed and the chambers fill with blood. The atria receive this blood from the venous system: the right atrium fills from systemic veins via the superior and inferior vena cavae, and the left atrium fills from the lungs via the pulmonary veins. So, the blood entering the atria during diastole comes from the veins. The other statements describe events that are not about the source of atrial filling—blood moving from the atria to the ventricles, blood flowing from arteries into the heart, or the heart as a whole contracting (which is systole), not diastole.

During diastole the heart muscles are relaxed and the chambers fill with blood. The atria receive this blood from the venous system: the right atrium fills from systemic veins via the superior and inferior vena cavae, and the left atrium fills from the lungs via the pulmonary veins. So, the blood entering the atria during diastole comes from the veins. The other statements describe events that are not about the source of atrial filling—blood moving from the atria to the ventricles, blood flowing from arteries into the heart, or the heart as a whole contracting (which is systole), not diastole.

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