Question

Cardiac output is determined by

• A. Heart rate
• B. Blood flow
• C. Stroke volume
• D. Both A and C

Answer 1

Answer: (D)

Cardiac output is the volume of blood pumped by the ventricles per unit time.
Cardiac output = Stroke volume $\times$ Heart rate
$=70mL$ / heart beat
Stroke volume is volume of blood pumped out of the heart at each beat.
Heart rate is numbers of beats per minute.
If heart rate and stroke volume are increased, cardiac output is also increased.