What measurement reflects the percentage of blood pumped out of a filled ventricle?

The measurement that reflects the percentage of blood pumped out of a filled ventricle is known as ejection fraction. Ejection fraction is a key parameter in evaluating the efficiency of the heart, specifically its ability to contract and pump blood effectively. It is calculated by taking the volume of blood ejected from the ventricle during each beat and dividing it by the total volume of blood in the ventricle at the end of diastole, which is when the ventricle is filled with blood.

This percentage provides crucial information about the heart's function, particularly in the context of heart disease. A normal ejection fraction typically ranges from 55% to 70%, signifying that a healthy heart pumps out more than half of the blood contained in the ventricles with each heartbeat. When the ejection fraction is lower than normal, it can indicate heart problems, such as heart failure or cardiomyopathy.

Cardiac output, while related to the overall blood flow from the heart, measures the volume of blood the heart pumps per minute, rather than the percentage of blood ejected relative to filling. Stroke volume refers to the amount of blood ejected from the ventricle during each heartbeat, but does not express this as a percentage of the