Question

The partial pressure of $C{O}_2$ in the venous blood is-

• A. Greater than the tissue spaces
• B. Lesser than in the tissue spaces
• C. Lesser than in the arterial blood
• D. Less than in alveoli

Answer 1

Answer: (B)

Lesser than in the tissue spaces

Partial pressure of C$O_2$ is higher in tissues than in systematic capillary blood because of carbon dioxide production during metabolism. The tissue space has 46 mmHg of pC$O_2$ and in venous blood it is 40 mmHg.

So the correct answer is 'Lesser than in the tissue spaces'.