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10 Cards in this Set
- Front
- Back
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Respirations 4 major functions
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1) pulmonary ventilation 2) diffusion of O2 and CO2 btwn alveoli and blood 3) transportation of O2 and CO2 in blood and body fluids 4)regulation of ventilation
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how are lungs expanded
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downward movement of diaphragm and elevation of ribs
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what causes slight suction btwn parietal pleura and lung
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lymphatic channels
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Pleural pressure definition
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pressure of fluid btwn lung pleura and chest wall pleura (slight neg pressure)
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pleural pressure at beginning of inspiration and end inspiration
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negative 5 cm of water and negative 7.5 cm of water
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zero reference pressure in the airways
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atmospheric pressure (0 cm h2o)
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alveolar pressure during inspiration and expiration
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negative 1 cm water and positive 1 cm water
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transpulmonary pressure
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difference btwn alveolar and pleural pressure - measure of elastic forces in lungs
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compliance of lungs
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extent to which the lungs will expand for each unit increase in transpulmonary pressure (~200 mL of air per cm of water)
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inspiratory compliance curve
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slow to fill lungs at first, then more rapid
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