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Respiratory Figs BW

Respiratory Figs BW - Functions of Respiratory System 1 Gas...

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Functions of Respiratory System 1. Gas Exchange - O 2 & CO 2 between blood and atmosphere 2. Regulation of Body pH - H+ + HCO 3 - H 2 CO 3 CO 2 + H 2 O - works with blood buffers and kidneys 3. Protection from Inhaled Pathogens/Irritants - viruses, spores, other particles 4. Vocalization
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Lungs & Thoracic Cavity Intra- pleural space
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Lung Lobules & Alveoli
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Properties of Gases P 1 V 1 = P 2 V 2 Boyle’s Law The P of a given volume of gas is inversely proportional to its volume. 0 Dalton’s Law The total P of a gas mixture (like air) equals the sum of the Ps that each gas in the mixture would exert independently. i.e., P humid air = P N2 + P O2 + P CO2 + P H2O = 760 mm Hg (at sea level) 0 200 400 600 800 0 10000 20000 30000 Altitude (ft) P (mm Hg) Total P P O2 (21%)
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Pressure Changes in Quiet Breathing Transpulmonary (Transmural) P = Alveolar P – Intrapleural P
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Physical Properties of Lungs Compliance (distensibility) V / P Fibrotic lung disease & inadequate surfactant secretion reduce lung compliance Elasticity
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