Coronary Artery Perfusion - Time of Occurrence

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Multiple Choice

Coronary Artery Perfusion - Time of Occurrence

Explanation:
Coronary artery perfusion mainly happens during diastole. When the heart relaxes and the aortic valve is closed, blood continues to flow from the aorta into the coronary arteries, supplying the heart muscle. During systole, the contracting myocardium compresses the intramyocardial vessels, significantly reducing coronary flow, so the heart receives its most consistent perfusion when it’s in diastole. Isovolumetric contraction occurs early in systole with all valves closed and no change in volume, so it does not provide coronary perfusion. Atrial systole contributes to filling the ventricles but is not the primary period for coronary blood flow.

Coronary artery perfusion mainly happens during diastole. When the heart relaxes and the aortic valve is closed, blood continues to flow from the aorta into the coronary arteries, supplying the heart muscle. During systole, the contracting myocardium compresses the intramyocardial vessels, significantly reducing coronary flow, so the heart receives its most consistent perfusion when it’s in diastole. Isovolumetric contraction occurs early in systole with all valves closed and no change in volume, so it does not provide coronary perfusion. Atrial systole contributes to filling the ventricles but is not the primary period for coronary blood flow.

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