Question

What is the normal ${pCO}_2$ of the capillary blood?

• A. 0.05 mm Hg
• B. 45 mm Hg
• C. 40 mm Hg
• D. 104 mmHg

Answer 1

The correct option is B

45 mm Hg

Partial pressure refers to the pressure exerted by a specific gas in a mixture of other gases. The partial pressure of carbon dioxide in the blood capillaries is usually around 45 mm Hg (deoxygenated blood).