Posted: August 16th, 2017

Which of the following terms describes the amount of blood ejected per heartbeat?

Which of the following terms describes the amount of blood ejected per heartbeat?
a) Stroke volume
Stroke volume is determined by preload, afterload, and contractility.
b) Cardiac output
Cardiac output is the amount of blood pumped by each ventricle during a given period and is computed by multiplying the stroke volume of the heart by the heart rate.
c) Ejection fraction
Ejection Fraction is the percentage of the end-diastolic volume that is ejected with each stroke, measured at 42–50% in the normal heart.
d) Afterload
Afterload is defined as the pressure that the ventricular myocardium must overcome to eject blood during systole and is one of the determinants of stroke volume.