A very rapid heart rate reduces cardiac output because:
A) venous return is increased.
B) ventricular fibrillation develops immediately.
C) conduction through the AV node is impaired.
D) ventricular filling is reduced.

Question

Quizplus · Accepted Answer

A very rapid heart rate reduces the time available for the ventricles to fill with blood during diastole, leading to reduced ventricular filling and consequently decreased cardiac output.

A Very Rapid Heart Rate Reduces Cardiac Output Because