Question

The resting tidal volume to vital capacity ratio should be

• A. 1:5
• B. 1:10
• C. 1:20
• D. 1:40

Answer 1

Answer: (B)

1:10

Tidal volume is the total volume of air normally inspired or expired in one breath during normal breathing. It is about 500 ml of air for an average, adult, normal person. But vital capacity is the maximum amount of air a person can expel from the lungs. VC varies from 3400 ml - 5000 ml depending upon the age, sex and height of the individual. Therefore the resting tidal volume to vital capacity ratio should be 1:10.