O2 is taken up and used in tissue respiration and CO2 is removed from the blood and expired as a waste product
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how do the gases move
they move via diffussion, from a high concentration to a low concentratio
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why does gaseouse exchange happen
due to a difference in partial pressure of gas in the lungs and blood
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what characteristiscs of the alveoli make for efficient gas exchange
constant blood supply into which gas can diffuse -- thin alveolar membrane -- large surface area -- moist lining which enables rapid solution of gas molecules -- short distance between alveolar membrane and capillary network
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name 3 effects of exercise on gaseouse exchange in the alveoli
increased capillary density -- increased blood plasma volume -- slight increase in vital capacity -- improved uptake of O2 by the muscles
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