Distinguish between (a) IRV and ERV (b) Inspiratory capacity and Expiratory capacity (c) Vital capacity and Total lung capacity | NCERT solution | Class 11 Biology | Unit-17 Breathing and exchange of gases



Q.13:- Distinguish between
(a) IRV and ERV
(b) Inspiratory capacity and Expiratory capacity
(c) Vital capacity and Total lung capacity

 

Answer
(a) IRV and ERV
Inspiratory reserve volume(IRV)
Expiratory reserve volume (ERV)
It is the maximum volume of air that can be inhaled after a normal inspiration. It is the maximum volume of air that can be exhaled after a normal expiration.
It is about 2500-3500 mL in the human lungs. It is about 1000-1100 mL in the human lungs.

(b) Inspiratory capacity and Expiratory capacity



Inspiratory capacity (IC)
Expiratory capacity (EC)
It is the volume of air that can be inhaled after a normal expiration. It is the volume of air that can be exhaled after a normal inspiration.
It includes tidal volume and inspiratory reserve volume. (IC = TV + IRV) It includes tidal volume and expiratory reserve volume. (EC = TV + ERV)

(c) Vital capacity and Total lung capacity

Vital capacity (VC)
Total lung capacity (TLC)
It is the maximum volume of air that can be exhaled after a maximum inspiration. It is the volume of air in the lungs after maximum inspiration. It includes IC, ERV, and residual volume.
It includes IC and ERV It includes IC, ERV, and residual volume.
It is about 4000 mL in the human lungs. It is about 5000-6000 mL in the human lungs.