Cardiac output is determined by.

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(D) Cardiac output is defined as the volume of blood pumped by each ventricle per minute.It is calculated by the formula: $	ext{Cardiac Output} = 	e

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both $(1)$ and $(2)$

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(D) Cardiac output is defined as the volume of blood pumped by each ventricle per minute.It is calculated by the formula: $	ext{Cardiac Output} = 	ext{Stroke Volume} 	imes 	ext{Heart Rate}$.Stroke volume is the amount of blood pumped by the ventricle in one beat (approximately $70 	ext{ mL}$).Heart rate is the number of beats per minute (approximately $72 	ext{ beats/min}$).Therefore, cardiac output depends on both heart rate and stroke volume.

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Statement-$I$ :- The body has the ability to alter the stroke volume as well as heart rate and thereby the cardiac output.
Statement-$II$ :- During each cardiac cycle two prominent sounds are produced which can not be easily heard through a stethoscope.

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