Diffusion Q1

Diffusion Q1

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1. Question
From the alveolus, oxygen diffuses across the respiratory membrane to the erythrocyte (RBC) traversing the capillary. This membrane has an average thickness of 0.5 µm. Movement across the alveolar membrane is termed diffusion.

The rate at which this occurs is affected mainly by which of the following factors?
- The surface area of the membrane
- Membrane thickness
- The partial pressure gradient of the gas
- The viscosity of blood
- The solubility of the gas in blood
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