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(D) During a cardiac cycle,each ventricle pumps out approximately $70 \; mL$ of blood,which is known as the stroke volume.Cardiac output is defined as

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$5 \; L$

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(D) During a cardiac cycle,each ventricle pumps out approximately $70 \; mL$ of blood,which is known as the stroke volume.Cardiac output is defined as the volume of blood pumped by each ventricle per minute.Cardiac output = Stroke volume $	imes$ Heart rate (number of beats per minute).Given that the average stroke volume is $70 \; mL$ and the average heart rate is $72$ beats per minute:Cardiac output = $70 \; mL 	imes 72 = 5040 \; mL/min$,which is approximately $5 \; L/min$.

In humans,the volume of blood pumped out by each ventricle per minute is

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