question_answer 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) Additional volume of air, a person can inspire by a forcible inspiration. This is about 2500-3000 mL. Expiratory Reserve Volume (ERV) Additional volume of air, a person can expire by a forcible expiration. This is about 1000-1100 mL. (b) Inspiratory capacity and Expiratory capacity Inspiratory Capacity (1C) Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume (TV+IRV). Expiratory Capacity (EC) Total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV). (c) Vital capacity and Total lung capacity Vital Capacity (VC) The maximum volume of air, a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration. Total Lung Capacity Total volume of air accommodated in the lungs at the end of a forced inspiration. This includes RV, ERV, TV and IRV or vital capacity + residual volume.