Which of the following factors determine cardiac stroke volume?
1) Ventricular preload
2) Ventricular afterload
3) Ventricular contractility
A)1 and 2 only
B)1 and 3 only
C)2 and 3 only
D)1, 2, and 3

Question

Quizplus · Accepted Answer

Ventricular preload, afterload, and contractility all influence cardiac stroke volume. Preload refers to the end-diastolic volume that stretches the ventricles to their greatest geometric dimensions under variable physiologic demand. Afterload is the pressure against which the heart must work to eject blood during systole. Contractility refers to the intrinsic ability of cardiac muscle fibers to contract at a given preload.

Which of the Following Factors Determine Cardiac Stroke Volume