Question

Go through the following matches

(i) Functional residual capacity = ERV + IRV + RV.
(ii) Expiratory capacity = TV + ERV.
(iii) Vital capacity = ERV + TV + IRV.
(iv) Total lung capacity = RV + ERV + IRV.
Which of these are correct?

Answer 1

Expiratory capacity = TV+ERV
The total volume of air a person can expire after a normal inspiration is called expiratory capacity. It includes the following:

• TV - 500mL.
• ERV - 1000 to 1100 mL.
• Hence the expiratory capacity is 1500 -1600 mL.
• So the given match in option (ii) is correct.

(4) (ii) and (iii)