Gas Exchange

Gas Exchange - Gas Exchange In a mixture of different gases...

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Unformatted text preview: Gas Exchange In a mixture of different gases, each gas contributes to the total pressure of the mixture. The contribution of each gas, called the partial pressure, is equal to the pressure that the gas would have if it were alone in the enclosure. Dalton's Law states that the sum of the partial pressures of each gas in a mixture is equal to the total pressure of the mixture. The following factors determine the degree to which a gas will dissolve in a liquid: • The partial pressure of the gas. According to Henry's Law, the greater the partial pressure of a gas, the greater the diffusion of the gas into the liquid. • The solubility of the gas. The ability of a gas to dissolve in a liquid varies with the kind of gas and the liquid. • The temperature of the liquid. Solubility decreases with increasing temperature. Gas exchange occurs in the lungs between alveoli and blood plasma and throughout the body...
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