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  4. The partial pressure of oxygen in the alveoli of the lungs is -

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Q. The partial pressure of oxygen in the alveoli of the lungs is -

NEETNEET 2016Breathing and Exchange of Gases

Solution:

Alveoli are the site of gaseous exchange and have a higher partial pressure of oxygen than that of blood. Blood is rich in carbon dioxide at cell and tissue levels due to cellular respiration. The higher partial pressure of oxygen in alveoli allow diffusion of oxygen into the blood.