Which of the Following is the Same as End-Diastolic Volume

Question

Which of the following is the same as end-diastolic volume?
A) Stroke volume
B) Cardiac output
C) Preload
D) Cardiac reserve

Accepted Answer

End-diastolic volume is the volume of blood present in the ventricle at the end of diastole, just before contraction. Preload refers to the pressure or stretch on the ventricular walls at the end of diastole and is directly related to the end-diastolic volume. Therefore, preload and end-diastolic volume are the same. Stroke volume (A) is the amount of blood ejected by the ventricle with each heartbeat, cardiac output (B) is the amount of blood pumped by the heart per minute, and cardiac reserve (D) is the difference between the maximum cardiac output and the cardiac output at rest. They are not the same as end-diastolic volume.