Cardiac output is a product of heart rate multiplied by ___________.

Peripheral resistance is a component of the equation for mean arterial pressure (MAP = CO x TPR), not a direct multiplier in the cardiac output formula.

Blood pressure is a consequence of cardiac output and vascular resistance combined, not a factor used to calculate cardiac output itself.

Total blood volume influences preload and therefore indirectly affects stroke volume, but it is not the direct variable multiplied by heart rate in the cardiac output equation.

The formula CO = HR x SV is a fundamental cardiovascular equation. Stroke volume represents the milliliters of blood pumped out of the ventricle with each contraction, and when multiplied by heart rate (beats per minute) it gives cardiac output in liters per minute. Both heart rate and stroke volume can be manipulated independently to alter cardiac output during rest or exercise.