Final answer:
Ejection fraction (EF) is the percentage of blood ejected from the heart with each contraction. Normal values range from 55-70 percent. SV and EDV are used to calculate EF.
Step-by-step explanation:
Ejection fraction (EF) is the percentage of blood that is pumped or ejected from the heart with each contraction. It is calculated by dividing the stroke volume (SV) by the end-diastolic volume (EDV). Normal values for EF range from approximately 55-70 percent, with a mean of 58 percent. Echocardiograms and specialized catheters are used to measure SV and EDV.