Stroke volume equation

Stroke volume equation

• A. End diastolic volume - end systolic volume
• B. End systolic volume - end diastolic volume
• C. End diastolic volume + end systolic volume
• D. Stroke volume equals heart rate times stroke volume

Answer: (A)

Stroke volume is the amount of blood ejected by the ventricle with each heartbeat. It’s determined by the difference between what the ventricle holds at the end of filling (end-diastolic volume) and what remains after contraction (end-systolic volume). So the calculation is SV = EDV − ESV. This reflects how much blood the heart pumps with each beat. The other options don’t fit: subtracting in the reverse order would give a negative value and isn’t how stroke volume is defined; adding the two volumes has no physical meaning for the amount ejected per beat; and multiplying stroke volume by heart rate describes cardiac output, not stroke volume alone.

Stroke volume is the amount of blood ejected by the ventricle with each heartbeat. It’s determined by the difference between what the ventricle holds at the end of filling (end-diastolic volume) and what remains after contraction (end-systolic volume). So the calculation is SV = EDV − ESV. This reflects how much blood the heart pumps with each beat.

The other options don’t fit: subtracting in the reverse order would give a negative value and isn’t how stroke volume is defined; adding the two volumes has no physical meaning for the amount ejected per beat; and multiplying stroke volume by heart rate describes cardiac output, not stroke volume alone.