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6. 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
7. How thick are the walls of the capillaries and alvioli?
- Two cells each
- One cell each
- One cell between them
- Three cells each
8. How do squamous cells aid the lungs in gas exchange?
- They are squashed together, so more of them can fit in an alviolus.
- They increase the distance the gases have to diffuse across
- They decrease the distance the gases have to diffuse across.
- They speed up gas exchange
9. 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