Other questions in this quiz

2. Why must the lungs maintain the diffusion gradient?

  • If the gradient is not maintained, the person will suffocate
  • If the gradient is not maintained, diffusion will stop because the gases have reached equilibrium
  • Diffusion will stop if the gradient is not maintained.
  • If the gradient is not maintained, the person will get carbon dioxide poisoning.

3. How do squamous cells aid the lungs in gas exchange?

  • They speed up gas exchange
  • They decrease the distance the gases have to diffuse across.
  • They increase the distance the gases have to diffuse across
  • They are squashed together, so more of them can fit in an alviolus.

4. How do the alvioli increase the exchange surface of the lungs?

  • They have a large surface area
  • They reduce the distance gas has to diffuse across.
  • They are numerous and folded
  • They are small and folded

5. What is the diameter of an alviolus?

  • 40-50µm.
  • 100-300µm
  • 500-700µm
  • 200-300µm

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