Which statement best describes ejection fraction?

Which statement best describes ejection fraction?

• A. The percentage of blood pumped out of the ventricle with each beat
• B. The volume of blood remaining in the ventricle after systole
• C. The time needed for ventricular contraction
• D. The rate at which blood is ejected from the ventricle

Answer: (A)

Ejection fraction is the percentage of blood in the ventricle that gets pumped out with each heartbeat. It’s calculated as stroke volume divided by end-diastolic volume, multiplied by 100. In a healthy heart, this is typically about 55–70%, meaning more than half of the filling blood is ejected with each beat. This measure reflects how effectively the ventricle contracts during systole. The phrase that describes the volume remaining in the ventricle after contraction refers to end-systolic volume, not the fraction ejected. The idea of time needed for ventricular contraction describes the duration of systole, not how much blood is ejected. The rate at which blood is ejected describes speed or flow, not the proportion of blood removed from the ventricle.

Ejection fraction is the percentage of blood in the ventricle that gets pumped out with each heartbeat. It’s calculated as stroke volume divided by end-diastolic volume, multiplied by 100. In a healthy heart, this is typically about 55–70%, meaning more than half of the filling blood is ejected with each beat. This measure reflects how effectively the ventricle contracts during systole.

The phrase that describes the volume remaining in the ventricle after contraction refers to end-systolic volume, not the fraction ejected. The idea of time needed for ventricular contraction describes the duration of systole, not how much blood is ejected. The rate at which blood is ejected describes speed or flow, not the proportion of blood removed from the ventricle.