Partial Pressures in Atmospheric vs Alveolar Air — NEET Biology

Which of the following statements accurately describe the principles governing gas exchange across the respiratory membrane? S1: The partial pressure gradient for oxygen between the alveoli and deoxygenated blood is substantially greater than that for carbon dioxide between deoxygenated blood and alveoli. S2: Carbon dioxide diffuses at a much faster rate across the respiratory membrane than oxygen, primarily due to its 20-25 times higher solubility. S3: The amount of carbon dioxide that can diffuse per unit partial pressure difference is significantly higher than that for oxygen. S4: If the diffusion membrane's thickness were to increase even slightly (e.g., to 1 mm), gas exchange would remain efficient due to the robustness of alveolar capillaries. S5: Favorable conditions for efficient gas exchange include not only appropriate partial pressure gradients and gas solubility but also optimal membrane thickness and surface area.