Gas Exchange
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| Dalton's Law of Partial Pressure | the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.
the pressure exerted by each gas, or its partial pressure, is directly proportional to its percentage in the total gas mixture
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| Henry's Law | when a mixture of gases comes in contact with a liquid, each gas will dissolve in the liquid in proportion to its partial pressure. Therefore, the greater the concentration of a gas in the mixture, the more and faster it will go into a solution.
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| Henry's Law II | should the partial P. of a gas become greater in the liquid than in the gas phase, some of the gas molec. will return to the gas phase. Therefore the direction and amount of gas movements are determined by the partial P. of the gas in the 2 phases
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| Henry's Law III | vol of the gas that will dissolve in a liquid @ any given partial pressure is proportional to the sol of the gas in the liquid. Among the gases found in air, CO2 is most soluble, o2 is only 1/20 as soluble as CO2, and N is insoluble in blood plasma
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| Henry's Law IV | the solubility of any gas in water (or plasma) decreases with increasing temperature
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| Physical Principles of Gas Exchange | Diffusion of gases through the respiratory membrane
Depends on membrane’s thickness, the diffusion coefficient of gas, surface areas of membrane, partial pressure of gases in alveoli and blood
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| Physical Principles of Gas Exchange | --Relationship between ventilation and pulmonary capillary flow
>Increased ventilation or increased pulmonary capillary blood flow increases gas exchange
>Physiologic shunt is deoxygenated blood returning from lungs
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