The volume of blood in a ventricle at the end of contraction (systole) is called which term?

The volume of blood in a ventricle at the end of contraction (systole) is called which term?

• A. End diastolic volume
• B. End systolic volume
• C. Stroke volume
• D. Cardiac output

Answer: (B)

The concept being tested is the volume left in the ventricle after it finishes contracting. That remaining blood is called end systolic volume. It contrasts with end diastolic volume, which is the amount in the ventricle at the end of filling (diastole) just before contraction. The amount ejected per beat, or stroke volume, is the difference between EDV and ESV, while cardiac output is the product of stroke volume and heart rate. So the term described here—the volume in the ventricle at the end of systole—is end systolic volume.

The concept being tested is the volume left in the ventricle after it finishes contracting. That remaining blood is called end systolic volume. It contrasts with end diastolic volume, which is the amount in the ventricle at the end of filling (diastole) just before contraction. The amount ejected per beat, or stroke volume, is the difference between EDV and ESV, while cardiac output is the product of stroke volume and heart rate. So the term described here—the volume in the ventricle at the end of systole—is end systolic volume.