The portion of blood that is pumped out of a filled
ventricle as a result of a heartbeat.
T he heart does not eject all of the blood that is in the ventricle. Normally,
about two-thirds of the blood is pumped out with each beat. That fraction is referred
to the ejection fraction.
The ejection fraction is an indicator of the heart's health. If the heart is
diseased from a heart attack or another cardiac condition, the ejection fraction
may fall, for example, to a third. Only a third of the blood in the ventricle (half
the normal two-thirds) is pumped out. The heart is essentially half-normal (in this
respect).
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