CHEM 212 Lecture Notes - Dorsal Respiratory Group, Ventral Respiratory Group, Spirometer
19 Jan 2013
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Document Summary
Greater partial pressure of o2 in alveolar air / more o2 dissolves in blood (henry"s law) Alveoli walls are composed of endothelium gases diffuse through 2 thin cells: alveoli is constantly moist, o2 can dissolve and diffuse through the cells into the blood. Alveoli contain phagocytes to kill bacteria that have not been trapped by mucus. O2 diffuses down its conc. gradient from air to blood; co2 diffuses from blood to air. Ventilation: flow of air in and out of alveoli. Tidal volume, vt, volume of air inhaled and exhaled in a normal single breath ( 0. 5 l) Functional residual capacity, frc, volume remaining in lungs after exhalation of tidal volume ( 2. 5 l) Expiratory reserve volume, er, volume of a maximal exhalation ( 1. 5 l) Residual volume, rv, volume remaining in lung after maximal exhalation ( 1l) Inspiratory reserve volume, ir, additional volume that can be inhaled after inhalation of tidal volume.
