Question

SHORT ANSWER: Define the terms end diastolic vilume (EDV) and end systolic volume (ESV) and relate them to the calculation of stroke volume.

Answer 1

Answer

End diastolic volume (EDV) : The amount of blood present in the ventricle just before the systole or at the end of diastole is known as end diastolic volume.
Normal average value for EDV is : 120 ml

End systolic volume (ESV) : The amount of blood remaining in the ventricle at the end of systole (ventricular contraction) or present at the beginning of the diastole is known as end systolic volume.
Normal average value for ESV is : 50 ml

Stroke volume is the amount of blood pumped by the left ventricle in one heart beat (contraction).

Stroke volume is the difference between end diatolic volume and end systolic volume.

Stroke volume is : End diastolic volume - End systolic volume

Example :

If EDV = 140 ml ; ESV is 70 ml

Stroke volume is 140 - 70 = 70 ml.