Compared to $O_{2}$ , the diffusion rate of $C O_{2}$ through the diffusion membrane per unit difference in partial pressure is much higher. Explain.

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Solution

Factors affecting diffusion of gases

The diffusion of gases depends on the following:
● Solubility of the gas

● Thickness of the membrane

● Partial pressure difference across the diffusion barrier etc.

Higher diffusion rate of $C O_{2}$
The solubility of $C O_{2}$ in the blood is $20 - 25$ times higher than that of $O_{2}$ . Therefore, the diffusion rate of $C O_{2}$ per unit difference in partial pressure through the diffusion membrane is considerably higher than that of $O_{2}$ .

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