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Question

# Stroke volume is the amount of blood the left ventricle pumps out in one cardiac cycle. This is around 70 ml. Now, to get the cardiac output, we have to multiply (i)__ with the normal heart rate of (ii)__ beats/min and we get (iii)__ ml/min. This means that in one minute, a normal heart pumps about (iv)__ litres of blood out.

A

(i) Stroke volume, (ii) 72, (iii) 5,040, (iv) 5

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B

(i) Total volume, (ii) 82, (iii)8,200, (iv) 8

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C

(i) Volume of the heart, (ii) 72,(iii)3,720, (iv) 3

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D

(i) Volume of the ventricles,(ii) 72, (iii)2,600,(iv) 2

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Solution

## The correct option is A (i) Stroke volume, (ii) 72, (iii) 5,040, (iv) 5 Stroke volume is the amount of blood the left ventricle pumps out in one cardiac cycle. This is around 70 ml. Now to get cardiac output we have to multiply stroke volume with the normal heart rate of 72 beats/min and we get 5,040 ml/min. This means that in one minute, a normal heart pumps about 5 litres of blood.

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