Disorders of Ventilation

3waystotransportco2dissolvedattached toh2o

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Unformatted text preview: T SILENT Pulmonary vein Partial Pressures of O2 and CO2 A = Alveolar Pressure a = Arterial Pressure V = Venous Pressure Partial Pressures of O2 and CO2 Partial Pressures • PAO2 partial pressure of O2 in the alveoli • PaO2 partial pressure of O2 in the arteries • PvO2 partial pressure of O2 in the venous system • Arteries 75­100mmHg normal Partial Pressures of O2 and CO2 Partial Pressures • PACO2 partial pressure of CO2 in the alveoli • PaCO2 partial pressure of CO2 in the arteries • PvCO2 partial pressure of CO2 in the venous system • 3 ways to transport CO2: dissolved, attached to H2O Factors Influencing Diffusion of Factors Influencing Diffusion of Gas • Thickness (inflamm process: thicker, CF, smoking, tumor) • Amount of surface area (scarring, tumors, black lung) • Solubility of Gas CO (Monoxide): extremely soluble, high Hb affinity takes O2’s place booo CO2 is 20x more soluble than O2 • Pressure difference of gases (high to low concentration CO2 and O2) Gas Transport • Oxygen transport – 98.5% oxygen is on Hg, 3% in plasma • Carbon dioxide transport – 10% Dissolved, 30% carried by Hb, 60% in blood as bicarbonate • Oxyhemoglobin dissociation c...
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This document was uploaded on 03/05/2014 for the course NURS 115 at Liberty University Duplicate.

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