With Which Term is Preload Synonymous

Question

With which term is preload synonymous?
A) Cardiac reserve
B) End-diastolic volume
C) Afterload
D) Ejection fraction

Accepted Answer

Preload is synonymous with end-diastolic volume, as it refers to the amount of blood in the ventricles just before systole. Cardiac reserve refers to the heart's ability to increase its cardiac output above rest levels, afterload refers to the resistance against which the heart has to work to eject blood, and ejection fraction is the percentage of blood that is ejected from the ventricle during systole.