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Answer: A respiratory surface has the following features:

  1. It has a large surface area for exchange of gases.
  2. It is thin (one cell thick) so the diffusion distance is short.
  3. It is kept moist, since gases diffuse in dissolved form.
  4. It is highly vascular (rich blood supply) to carry gases to and from it.
  5. It is permeable to O2 and CO2.
  6. It is protected and well ventilated so that a concentration gradient is maintained.
Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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