The cardiac output of a person is calculated by multiplying the stroke volume and the heart rate. Stroke volume is the volume of blood pumped out of the left ventricle of the heart during each systolic cardiac contraction. Heart rate, or pulse, is the number of times your heart beats per minute. Hence, to alter a person's cardiac output both the stroke volume and the heart rate can be altered. So, the cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 ml would be . Thus, the correct answer is 3600 ml .

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