Question

Cardiac output is

• A. 4 litres/minute
• B. 5.3 litres/minute
• C. 6.3 litres/minute
• D. 7.3 litres/minute

Answer 1

The correct option is B 5.3 litres/minute

Cardiac output is defined as the volume of blood pumped by left ventricle into the aorta per minute.

It is calculated as:

Cardiac output = Stroke volume (SV) x Heart rate (HR)

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

Therefore, cardiac output = 70 mL x 75

= 5250 mL/ min or 5.25 L/min ≈ 5.3 L/min

So, the correct answer is '5.3 litres/minute'.