Stroke volume
The amount of blood pumped by the left ventricle of the heart in one contraction. The stroke volume is not all of the blood contained in the left ventricle. The heart does not pump all the blood out of the ventricle. Normally, only about two-thirds of the blood in the ventricle is put out with each beat.

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stroke volume n the volume of blood pumped from a ventricle of the heart in one beat

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the amount of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume.

Medical dictionary. 2011.

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