Question

What part of the volume loop represents diastole?

a) The bottom of the loop (end-diastolic volume)
b) The top of the loop (end-systolic volume)
c) The left side of the loop (stroke volume)
d) The right side of the loop (ejection fraction)

Answer 1

The diastole phase is represented by the bottom of the volume loop, which is called the end-diastolic volume (EDV).

Step-by-step explanation:

The correct answer is a) The bottom of the loop (end-diastolic volume).

During diastole, the heart muscle relaxes, and blood fills the ventricles. The end-diastolic volume (EDV) represents the amount of blood in the ventricles at the end of atrial systole just before ventricular contraction. This is the bottom of the volume loop.

On the other hand, systole refers to the phase of the cardiac cycle when the heart contracts and pushes the blood out of the heart. The top of the loop represents the end-systolic volume (ESV), which is the amount of blood remaining in each ventricle following systole.