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Gases diffuse over the respiratory surface because of

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Gases diffuse over the respiratory surface because of

(a) O2 is more in alveoli than in blood 

(b) O2 is more in blood than in tissues 

(c) CO2 is more in alveoli than in blood 

(d) PCO2 is more in blood than in tissues

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(a) O2 is more in alveoli than in blood

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