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The cardiac output is simply the amount of blood pumped by the heart per minute. Necessarily, the cardiac output is the product of the heart rate , which is the number of beats per minute, and the stroke volume , which is amount pumped per beat. CO = HR X SV The cardiac output is usually expressed in liters/minute. For someone weighing about 70 kg (154 lbs), the cardiac output at rest is about 5 liters/minute. In this case, if the heart rate is 70 beats/min, the stroke volume would be a little more than 70 ml/beat. But of course this changes dramatically as a person begins to exercise. For a typical, fit young person, the cardiac output might go up to about 20 liters/min at the peak of exercise. However, for a world-class athlete in an endurance sport, the maximum cardiac output might be around 35 liters/min. https://courses.washington.edu/conj/heart/cardiacoutput.htm The overall blood pressure as measured in the brachial artery is maintained by the cardi...