PLN 203 Lecture Notes - Lecture 13: Cellular Respiration, Carbonic Anhydrase, Ph
27 Apr 2017
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Document Summary
Gas exchange: occurs b/w blood and alveolar air across the respiratory membrane, depends on, partial pressure of the gasses, diffusion of molecules b/w gas and liquid. Gas laws: diffusion occurs in response to concentration gradients, rate of diffusion depends on physical principles or gas laws (i. e. boyle"s law) Dalton"s law and partial pressure: composition of air. Solubility of body fluids: co2 very soluble, o2 less soluble, n2 very low solubility. In pulmonary vein plasma: pco2 40mmhg, po2 100mmhg, pn2 573mmhg. Diffusion and respiratory function: direction and rate of diffusion of gases across the respiratory membrane, determine different partial pressures and solubility"s. Partial pressure in alveolar air and alveolar capillaries: blood arriving in pulmonary arteries has low po2 and high pco2, rapid exchange allows blood and alveolar air to reach equilibrium. The concentration gradient causes oxygen to enter the blood and co2 to leave. Partial pressure in the systemic circuit: oxygenated blood mixes with deoxygenated blood from conducting passageways.
