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## Respiratory Volumes ### Residual Volume (RV) Volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL. ### Inspiratory Capacity (IC) Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory rese...
## Respiratory Volumes ### Residual Volume (RV) Volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL. ### Inspiratory Capacity (IC) 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). ### Functional Residual Capacity (FRC) Volume of air that will remain in the lungs after a normal expiration. This includes ERV+RV. ### 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 (TLC) 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. ## Exchange of Gases Alveoli are the primary sites of exchange of gases. Exchange of gases also occur between blood and tissues. $O_2$ and $CO_2$ are exchanged in these sites by simple diffusion mainly based on pressure/concentration.
