ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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area where its partial pressure is higher to an area where its partial pressure is lower
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area where its partial pressure is lower to an area where its partial pressure is higher
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area that have the same partial pressure with the other area
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Detailed explanation-1: -Gases diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure. The partial pressure of a gas is measured in millimeters of mercury. At the venous end of tissue capillaries, there is no net movement of O2 and CO2.
Detailed explanation-2: -Gases move in both directions during diffusion, but the area of higher partial pressure, because of its greater number of molecules per unit volume, has proportionately more random “departures.” Thus, the net movement of gas is dependent on the partial pressure difference between the 2 areas.
Detailed explanation-3: -The rate of diffusion of a gas is proportional to its partial pressure within the total gas mixture.
Detailed explanation-4: -Gas exchange between the alveolus and the capillary depends on passive diffusion of gas from a region of higher partial pressure to one of lower partial pressure.