How is stroke volume calculated?

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Multiple Choice

How is stroke volume calculated?

Explanation:
Stroke volume is the amount of blood the ventricle ejects with each heartbeat. It is determined by how much blood is present in the ventricle at the end of filling (end-diastolic volume) and how much remains after contraction (end-systolic volume). The difference between EDV and ESV gives the volume expelled per beat: SV = EDV − ESV. You can also relate stroke volume to cardiac output and heart rate with CO = SV × HR, which rearranges to SV = CO/HR. Both expressions are correct, but the direct calculation from ventricular volumes shows exactly what portion of the filling volume is pumped out with each beat. Typical values: EDV ~120 mL, ESV ~50 mL, giving SV ~70 mL.

Stroke volume is the amount of blood the ventricle ejects with each heartbeat. It is determined by how much blood is present in the ventricle at the end of filling (end-diastolic volume) and how much remains after contraction (end-systolic volume). The difference between EDV and ESV gives the volume expelled per beat: SV = EDV − ESV.

You can also relate stroke volume to cardiac output and heart rate with CO = SV × HR, which rearranges to SV = CO/HR. Both expressions are correct, but the direct calculation from ventricular volumes shows exactly what portion of the filling volume is pumped out with each beat. Typical values: EDV ~120 mL, ESV ~50 mL, giving SV ~70 mL.

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