ANP 1105 Lecture Notes - Lecture 14: Morphine, Great Vessels, Brainstem
2 Dec 2016
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Total pressure exerted by a mixture of gases = sum of pressures exerted by each gas (partial pressure) in mixture partial pressure of each gas directly proportional to its % in mixture. High altitude: all partial pressures decrease in direct proportion. Below sea level: atmospheric pressure increases by 1 atmosphere (760 mm hg) for every 33 feet down (in water); partial pressures increase accordingly. O2 from air to blood & co2 from blood to air in lungs. Conducting zone passageways have humidified the air. Alveolar gas mixed with new atmospheric gas with every breath. Increased depth of breathing increases alveolar po2 & decreases pco2 efficient mixing. At a constant temperature, the amount of a given gas dissolved in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid. Stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant.
