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Gas Exchange (factors influencing gas diffusion at the respiratory…
Gas Exchange
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respiration
external
pulmonary arterioles bring de-oxygenated blood past alveoli => O2 diffuses into the blood and CO2 diffuses out into the alveoli
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internal
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oxygenated blood flows past tissue which is oxygen poor and diffuses into the tissue, CO2 diffuses into the blood in the capillary