Which of the following is the correct equation for stroke volume?

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Multiple Choice

Which of the following is the correct equation for stroke volume?

Explanation:
Stroke volume is the amount of blood ejected by the ventricle with each heartbeat. It equals the difference between end-diastolic volume (the blood in the ventricle before contraction) and end-systolic volume (the blood left after contraction). So SV = EDV − ESV. For example, if EDV is 120 mL and ESV is 50 mL, SV is 70 mL. The other expressions don’t describe the amount pumped per beat: subtracting in the opposite order would give a negative value, dividing volumes is a ratio, and adding them yields a total not the pumped amount.

Stroke volume is the amount of blood ejected by the ventricle with each heartbeat. It equals the difference between end-diastolic volume (the blood in the ventricle before contraction) and end-systolic volume (the blood left after contraction). So SV = EDV − ESV. For example, if EDV is 120 mL and ESV is 50 mL, SV is 70 mL. The other expressions don’t describe the amount pumped per beat: subtracting in the opposite order would give a negative value, dividing volumes is a ratio, and adding them yields a total not the pumped amount.

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