| A | B |
| tidal volume | normal breathing -- the volume of air inhaled and exhaled in a normal respiratory cycle |
| inspiratory reserve volume | the maximun volume of air that one can inhale at the end of the inspiratory posistion |
| expiratory reserve volume | the maximum volume of air that one can exhale at the end of the expiratory position |
| residual volume | the volume of air remaining in the lungs that can never be expired even with the maximum effort. |
| vital capacity | the maximum volume of air that one can expire immediately following a maximum inspiratory effort |
| inspiratory capacity | the maximum volume of air that can be inspired form the resting respiratory levelfunctional residual capacity |
| functional residual capacity | the volume of air remaining in the lungs at the resting expiratory level |
| total lung capacity | the amount of air contained in the lungs at the end of maximum inspiration |
| carbonic anhydrase | As carbon dioxide diffuses into tissue capillaries and enters RBC's, it reacts with water to form carbonic acid. |
| carbonic acid | As carbon dioxide diffuses into tissue capillaries and enters RBC's, it reacts with water in the presence of carbonic anhydrase to form |