Explain the transport of O2  and CO2  between alveoli and tissue with a diagram.

Answers (1)

In alveoli, the partial pressure of O2 is 104 mm Hg, and that of CO2 is 40 mm Hg. While the blood is deoxygenated, pO2 is 40 mm Hg. This is much less than the pO2 in alveoli.

Thus oxygen enters the blood in alveoli.

In deoxygenated blood, the partial pressure of CO 2 is 45 mm Hg. This is much more than the partial pressure of CO 2 in alveoli. Thus, carbon dioxide exits from tissue cells and enter the alveoli.

Once the blood reaches the tissues, the partial pressure of oxygen present in the oxygenated blood is 95 mm.
Thus, oxygen from the blood enters the tissues. At the tissue level, the partial pressure of carbon dioxide in deoxygenated blood is more than that in oxygenated blood. Hence, carbon dioxide exits from the tissues.

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