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Transport of Carbon Dioxide

The partial p...

Question

The partial pressure of $C O_{2}$ in the air inside the lungs compared to venous blood is

A

higher

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B

lower

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C

equal

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D

variable

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Solution

The correct option is B lower
Venous blood is the deoxygenated blood that returns to the lungs after giving out its oxygen to the tissues. The partial pressure of $C O_{2}$ reaching the alveolar capillaries is 45 mmHg whereas partial pressure of carbon dioxide in the alveolar air is 40 mmHg. Therefore, $C O_{2}$ rapidly leaves the blood capillaries and enters the alveoli.

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