What occurs during diastole?

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Multiple Choice

What occurs during diastole?

Explanation:
During diastole the ventricles relax after contracting in the prior phase. This relaxation lowers ventricular pressure, allowing the mitral and tricuspid valves to open and blood to flow passively from the atria into the ventricles. Atrial contraction toward the end of diastole (the atrial kick) adds a final amount of filling. Diastole is the quieter phase between heart sounds that mark valve closure during systole. Additionally, coronary perfusion to the heart muscle primarily occurs when the heart is relaxed, so oxygen delivery to the myocardium is greatest during diastole. So the defining feature is the ventricles relaxing to permit filling.

During diastole the ventricles relax after contracting in the prior phase. This relaxation lowers ventricular pressure, allowing the mitral and tricuspid valves to open and blood to flow passively from the atria into the ventricles. Atrial contraction toward the end of diastole (the atrial kick) adds a final amount of filling. Diastole is the quieter phase between heart sounds that mark valve closure during systole. Additionally, coronary perfusion to the heart muscle primarily occurs when the heart is relaxed, so oxygen delivery to the myocardium is greatest during diastole. So the defining feature is the ventricles relaxing to permit filling.

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