Breathing And Exchange Of Gases Ques 33
33. What is vital capacity of the lungs?
[1988]
(a) Inspiratory reserve volume plus tidal volume
(b) Total lung capacity minus expiratory reserve volume
(c) Inspiratory reserve volume plus expiratory reserve volume
(d) Total lung capacity minus residual volume
Show Answer
Answer : d
Hints & Solution
(d) Vital capacity of lungs is the largest possible expiration after largest possible inspiration. Volume of air that can be exchanged in a single respiration or the amount of air breathed in and out with greatest possible efforts. $ \begin{alignedat} VC = TRV + TV + ERV \\ & =3000+500+1100 \\ & = 4600 ml. \end{aligned} $
BETA
