Question

Partial pressure of water vapour in lung changes or constant

Answer 1

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Its an interesting question regarging concepts.
》》Yes, of course, the partial pressure of water vapour in the lung changes.

■] As the air enters the lungs, it is humidified by the upper airway and thus there is the presence of water vapour inside .
■] The partial pressure of water vapour which is 47 mmHg reduces the oxygen partial pressure to about 150 mmHg.

■]The rest of the difference in the partial pressure of water vapour in lung is due to the continual process of uptake of oxygen by the pulmonary capillaries , and
■] because of the continual process of diffusion of CO2 out of the capillaries into the alveoli, the pressure of water vapour changes in the lungs.


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Answer 2

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