To maintain a consistent cardiac output,what happens to SV as HR increases?
A)Stroke volume increases.
B)Stroke volume decreases.
C)Stroke volume stays the same.
D)Cannot be determined from the information given.

Question

Quizplus · Accepted Answer

In order to maintain a consistent cardiac output, the heart rate must increase to compensate for a decrease in stroke volume. This is due to the Frank-Starling mechanism, where an increase in preload (end-diastolic volume) results in a greater stretch of the cardiac muscle fibers, leading to a stronger contraction and a higher stroke volume. However, there is a limit to how much stroke volume can increase, and beyond a certain point, further increases in heart rate will result in a decrease in stroke volume as the heart does not have enough time to fill with blood between contractions. Therefore, as heart rate increases, stroke volume will eventually decrease to maintain a consistent cardiac output.

To Maintain a Consistent Cardiac Output,what Happens to SV as HR