What happens during diastole?

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Study for the Cardiovascular System Test. Learn about heart anatomy, function, and circulatory pathways with flashcards and multiple-choice questions. Each question provides detailed explanations. Get prepared for your exam!

Multiple Choice

What happens during diastole?

Explanation:
During diastole, the heart muscle relaxes after a beat. The ventricles relax and fill with blood from the atria, with the atrioventricular valves (mitral and tricuspid) open to allow this flow while the semilunar valves (aortic and pulmonary) stay closed to prevent backflow. As filling progresses, there’s rapid filling followed by a slower phase, and toward the end of diastole the atria contract to top off ventricular filling. In short, diastole is the relaxation and filling phase of the cardiac cycle.

During diastole, the heart muscle relaxes after a beat. The ventricles relax and fill with blood from the atria, with the atrioventricular valves (mitral and tricuspid) open to allow this flow while the semilunar valves (aortic and pulmonary) stay closed to prevent backflow. As filling progresses, there’s rapid filling followed by a slower phase, and toward the end of diastole the atria contract to top off ventricular filling. In short, diastole is the relaxation and filling phase of the cardiac cycle.

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