Physiology 3120 Lecture Notes - Breathing, Pulmonary Alveolus, Vo2 Max
20 Nov 2012
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Document Summary
Vgas = (c p a)/t diffusion constant is proportional to the gas solubility and inversely proportional to the square root of its molecular weight. Partial pressue total pressure times the fractional concentration. In the lungs must subtract 47 mmhg because of water saturation. 1-16 trachea terminal bronchiole is conducting zone, 17-23 respiratory bronchiole to alveolar sac is transitional and respiratory zone. Major inspiratory muscles: diaphragm (innervated by phrenic nerves) and external intercostals. Major expiratory muscles: muscles of the abdominal wall, internal intercostals. Pulmonary compliance = difference in volume / difference in pressure. Lung is most compliant between 10-20 cm h2o. 1/3 of the lungs pressure is caused by the elastic forces and 2/3 is the surface tension. Tidal volume volume of air inhaled with each breath. Vital capacity volume of air that can be forcibly exhaled after a maximal inspiration. Residual volume volume of air remaining in the lungs after a maximal expiration.
