Consider the following statements regarding gas exchange in the human alveoli: 1. The respiratory membrane consists of the alveolar squamous epithelium, the capillary endothelium, and their fused basement membranes. 2. Diffusion of carbon dioxide across the respiratory membrane is much faster than that of oxygen because carbon dioxide has higher solubility in blood plasma. 3. Surfactant secreted by Type I alveolar cells reduces surface tension and prevents alveolar collapse. Which of the statements given above is/are correct?

Options:

• A: 1 and 3 only
• B: 2 and 3 only
• C: 1, 2 and 3
• D: 1 and 2 only

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