V3 - Physiology of Respiration V Basic Properties of Gases...

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Physiology of Respiration V. Basic Properties of Gases A. Dalton's Law of Partial Pressures 1. partial pressure - the "part" of the total air pressure caused by one component of a gas Gas Percent Partial Pressure (P) ALL AIR 100.0% 760 mm Hg Nitrogen 78.6% 597 mm Hg (0.79 X 760) Oxygen 20.9% l59 mm Hg (0.21 X 760) Carbon Dioxide 0.04% 0.3 mm Hg (0.0004 X 760) 2. altitude - air pressure @ 10,000 ft = 563 mm Hg 3. scuba diving - air pressure @ 100 ft = 3000 mm Hg B. Henry's Law of Gas Diffusion into Liquid 1. Henry's Law - a certain gas will diffuse INTO or OUT OF a liquid down its concentration gradient in proportion to its partial pressure 2. solubility - the ease with which a certain gas will "dissolve" into a liquid (like blood plasma) HIGHest solubility in plasma Carbon Dioxide Oxygen LOWest solubility in plasma Nitrogen C. Hyperbaric (Above normal pressure) Conditions 1. Creates HIGH gradient for gas entry into the body 2. therapeutic - oxygen forced into blood during: carbon monoxide poisoning, circulatory
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V3 - Physiology of Respiration V Basic Properties of Gases...

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