During exercise, your heart rate can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 144 beats per minute, approximately how long would diastole last in a single cardiac cycle?
A) 0.2 second
B) 0.6 second
C) 0.8 second
D) 1.6 seconds

Question

Quizplus · Accepted Answer

At a heart rate of 144 beats per minute, each cardiac cycle lasts about 0.42 seconds (60 seconds / 144 beats). Diastole typically takes up about two-thirds of the cardiac cycle, so it would last approximately 0.28 seconds, closest to 0.2 seconds.

During Exercise, Your Heart Rate Can Increase Dramatically in Order