Each resting heartbeat ejects about 70 milliliters
At rest, a healthy left ventricle pushes out roughly 70 milliliters of blood per beat — about a quarter-cup, not a bucket.
Multiply by a resting rate near 70 beats a minute and output lands around 5 liters a minute. Exercise can raise both the rate and the amount squeezed out each time.
Stroke volume is the quiet half of that output. The beat you feel is a small, repeated shove.
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