Question

Cardiac output is determined by

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

Answer 1

The correct option is D Both B and C

Cardiac output is calculated as: Stroke volume (SV) x Heart rate (HR)

(where, stroke volume is the amount of blood supplied to heart by the veins which is about 5250 mL/min and the heart rate or heart beat is about 75)

It is defined as the volume of blood pumped by left ventricle into the aorta per minute. Its value is:

cardiac output = 70 mL x 75

= 5250 mL/ min or 5.25 L/min

So, the correct answer is 'Both B and C'.