PHYSL212 Study Guide - Pulmonary Pleurae, Alveolar Pressure, Electronvolt
13 Oct 2014
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Document Summary
Respiration 3: mechanical properties where no air is flowing (necessary to maintain lung and chest wall at a certain volume) Dynamic properties of the lung: mechanical properties when the lungs are changing volume and air is flowing in and out (necessary to permit airflow) Exchange of air between the atmosphere and the alveoli (bulk flow gas from high pressure to low pressure) Relation of the lungs to the thoracic wall. The pleurae form a thin double-layered envelope. The parietal pleura covers the thoracic wall and superior face of the diaphragm. The visceral pleural covers the external surface of the lung. Intrapleural fluid (~10ml) reduces friction of lung against thoracic wall during breathing (extremely thin, 5 to 35um) Pressure that causes the movement of air in and out of the lungs. During inspiration and expiration, the air moves in and out of the lungs due to variations of the: intrapleural pressure, alveolar pressure, transpulmonary pressure.
