Final answer:
The ejection fraction is the proportion of left ventricular volume pumped out during systole, calculated by dividing stroke volume by end diastolic volume. It reflects the heart's pumping efficiency and normally ranges from 55-70 percent.
Step-by-step explanation:
The proportion of the left ventricular volume that is pumped out of the heart during systole is known as the ejection fraction. Ejection fraction is calculated by dividing the stroke volume (SV) by the end diastolic volume (EDV), with the stroke volume being the quantity of blood pumped out of the ventricle during a single heartbeat and EDV representing the preload, or the total volume of blood in the ventricles just prior to contraction. The ejection fraction provides insight into the heart's function, indicating how well the heart is pumping; normal ranges are between about 55-70 percent.