First slide

Mechanism of Breathing

Question

The volume of air a healthy man normally inspires or expires is

Easy

A

500 mL per minute
B

6 to 8 litres per minute
C

4 to 6 litres per minute
D

10 to 12 litres per minute

Solution

The volume of air a healthy man normally inspires or expires is 500 mL per breath (tidal volume). On an average, a healthy human breathes 12-16 times per minute. So, volume of air a healthy man normally inspires or expires is (500 mL x 12-16) per minute = 6,000 to 8,000 mL per minute = 6 to 8 litres per minute.

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