Questions: Home My Evol 8/19/24 Week 3 Practice Test 47. Which of the following refers to the amount of blood in the ventricle at the end of its resting phase (diastole)? A. Ejection fraction B. Cardiac reserve C. Preload D. Afterload Page 47 of 75 Previous Page Nextpage Save Answers

The answer is C: Preload.

Explanation for each option:

A. Ejection fraction - This refers to the percentage of blood that is pumped out of the ventricles with each heartbeat. It is not related to the amount of blood in the ventricle at the end of diastole.

B. Cardiac reserve - This is the difference between the rate at which the heart pumps blood at a particular time and its maximum capacity for pumping blood. It does not refer to the amount of blood in the ventricle at the end of diastole.

C. Preload - This is the term used to describe the amount of blood in the ventricle at the end of its resting phase (diastole). It is the initial stretching of the cardiac myocytes prior to contraction, related to the volume of blood returning to the heart.

D. Afterload - This refers to the pressure that the heart must work against to eject blood during systole. It is not related to the amount of blood in the ventricle at the end of diastole.

In summary, preload is the correct term for the amount of blood in the ventricle at the end of diastole.