End-diastolic volume occurs at the end of which phase of the cardiac cycle?

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Multiple Choice

End-diastolic volume occurs at the end of which phase of the cardiac cycle?

End-diastolic volume is the amount of blood in the ventricle as filling ends. During ventricular diastole the ventricle relaxes and fills from the atrium; atrial contraction helps complete filling, and the ventricle reaches its maximum volume just before contraction begins. That moment marks the end of diastole. Once systole starts, the heart contracts and ejects blood, so the volume changes during ejection and the phase called isovolumetric contraction occurs with no change in volume. Thus, end-diastolic volume occurs at the end of ventricular diastole.

End-diastolic volume is the amount of blood in the ventricle as filling ends. During ventricular diastole the ventricle relaxes and fills from the atrium; atrial contraction helps complete filling, and the ventricle reaches its maximum volume just before contraction begins. That moment marks the end of diastole. Once systole starts, the heart contracts and ejects blood, so the volume changes during ejection and the phase called isovolumetric contraction occurs with no change in volume. Thus, end-diastolic volume occurs at the end of ventricular diastole.

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