Gas Exchange - 3/14/2010 TOPIC 11 GAS EXCHANGE GAS EXCHANGE...

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TOPIC 11 GAS EXCHANGE GAS EXCHANGE “gas exchange” refers to the uptake of O 2 from the environment and the release of CO 2 to the environment. .. equivalent term. .. “respiration” not “aerobic respiration” !
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DALTON’S LAW “every gas in a mixture of gases contributes to the total pressure of the mixture” each gas has a partial pressure e.g. air is a mixture of gases. .. at sea level air pressure = = 1 atmosphere (1 atm) = 101.325 kPa = 760 mm Hg = 760 Torr PARTIAL PRESSURE OF GASES IN AIR for nitrogen (N 2 )... for o gen (O ) for oxygen (O 2 )... for carbon dioxide (CO 2 )... note that the partial pressures of O 2 and CO 2 in alveolar gas differ greatly from that of air in part because air is humidified as it travels along our airways
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PARTIAL PRESSURE GRADIENTS gases diffuse down pressure gradients , according to the partial pressures (pp) of those gases. .. since the partial pressure of a gas decreases at a site since the partial pressure of a gas decreases at a site since gas molecules diffuse from regions of high pp to regions of low pp. .. differences in partial pressures allow for gas exchange at various sites in the body RESPIRATORY MEDIA some animals use water , others use air as a respiratory medium. .. a source of O 2 water air O conten O 2 content density viscosity diffusion rates energy needed to use
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RESPIRATORY SURFACES (1) cell membranes over which gas exchange occurs are in contact with water. .. respiratory surfaces are always moist .. rate of diffusion
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Gas Exchange - 3/14/2010 TOPIC 11 GAS EXCHANGE GAS EXCHANGE...

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