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The structure of organs is always relevant to function. The function of respiratory surfaces is gaseous exchange. The structure would therefore facilitate this as follows:
1. A single layer of squamous epithelial cells.
2. A large blood supply to the surface.
3. A large surface area.
4. Counter-current flow of medium to blood. (This means that the blood and air/water are flowing in opposite directions so as to increase the concentration gradient).
- Large surface area to facilitate gas exchange.
- Thin and moist to allow for rapid diffusion of gases.
- Well-vascularized to ensure efficient transport of gases.
- Protective mechanisms to prevent desiccation or damage.
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