If EDV is 130 mL and SV is 70 mL, what is ESV?

If EDV is 130 mL and SV is 70 mL, what is ESV?

• A. 60 mL
• B. 130 mL
• C. 70 mL
• D. 200 mL

Answer: (A)

Stroke volume is how much blood the ventricle ejects per beat, and it equals the filling volume before contraction (end-diastolic volume) minus the volume left after contraction (end-systolic volume). So, ESV = EDV − SV. With EDV = 130 mL and SV = 70 mL, the end-systolic volume is 130 − 70 = 60 mL. This reflects the amount remaining in the ventricle after ejection. The other numbers don’t fit because they’d imply either no ejection, the wrong remaining volume, or an impossible scenario (e.g., ejecting more than you filled).

Stroke volume is how much blood the ventricle ejects per beat, and it equals the filling volume before contraction (end-diastolic volume) minus the volume left after contraction (end-systolic volume). So, ESV = EDV − SV. With EDV = 130 mL and SV = 70 mL, the end-systolic volume is 130 − 70 = 60 mL. This reflects the amount remaining in the ventricle after ejection. The other numbers don’t fit because they’d imply either no ejection, the wrong remaining volume, or an impossible scenario (e.g., ejecting more than you filled).