I8 - Physiology of Respiration I The Mechanics of Breathing...

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Physiology of Respiration I. The Mechanics of Breathing A. Relationships of Pressure 1. atmospheric air pressure 760 mm Hg (at sea level) 2. negative air pressure - LESS than 760 mm Hg 3. positive air pressure - MORE than 760 mm Hg 4. intrapleural pressure - pressure within the pleural "balloon" which surrounds the lung 5. intrapulmonary pressure - pressure within the alveoli (tiny sacs) of the lung itself Factors holding lungs AGAINST the thorax wall: 1. Surface tension holding the "visceral" and "parietal" pleura together 2. Intrapulmonary pressure ALWAYS slightly greater than intrapleural pressure by 4 mm Hg 3. Atmospheric pressure acting on the lungs a. atelectasis (collapsed lung) - hole in pleural "balloon" causes equalization of pressure and collapse of the lung b. pneumothorax - abnormal air in the intrapleural space, can lead to collapsed lung Factors facilitating lung movement AWAY from thorax wall: 1.
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This note was uploaded on 01/29/2012 for the course SCIE SYG2000 taught by Professor Bernhardt during the Fall '10 term at Broward College.

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I8 - Physiology of Respiration I The Mechanics of Breathing...

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