BIOL 2P97 Lecture Notes - Lecture 14: Breathing, Bronchus, Bronchiole
Document Summary
Defined as bulk flow of air from the atmosphere to the alveoli. Lung volumes during ventilation fig 17. 7 b: tidal volume: air that moves with normal inspiration/expiration (500ml per breath for normal person, inspiratory reserve volume: additional volume that could be breathed in (extra. 3l: expiratory reserve volume: air that could be forcefully exhaled after a normal expiration, residual volume: volume left in the respiratory system after maximum exhalation. Lung capacities: the sum of 2 or more volumes. Inspiratory capacity: tidal volume + inspiratory reserve volume. Vital capacity: tidal volume + inspiratory reserve volume +expiratory reserve volume (no residual volume) ** mc question. Basic principles [look at textbook for breathing/lung pictures] Air always travels from an area of high pressure to low pressure. Intrapulmonary pressure and volume (pressure in the lungs) Intrapleural pressure (seen as negative pressure(not a true negative-can"t have that) less than the atmosphere) Elastic recoil of lungs (pulling the lungs inwards)