Other questions in this quiz

2. How far do gases have to diffuse to be exchanged in the lung?

  • 2µm
  • 0.5µm
  • 1µm
  • 3µm

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

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

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

  • They speed up 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 increase the distance the gases have to diffuse across

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

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

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