How the lungs are adapted for gas exchange

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  • Created by: emily_w
  • Created on: 18-11-14 12:33

1. Why does a large surface area increase the efficiency of the lungs?

  • More gas can be exchanged at the same time
  • The lungs can inflate more.
  • Gas can be exchanged faster
  • More types of gas can be exchanged
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2. How far do gases have to diffuse to be exchanged in the lung?

  • 0.5µm
  • 3µm
  • 1µm
  • 2µm

3. How does the transport system maintain the diffusion gradient?

  • There is low pressure in the capillaries
  • Oxygenated blood cells are removed via the capillaries
  • The capillaries widen
  • Qxygenated blood is transported around the body

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

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

5. 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.

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