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6. how are the alveoli in the lungs adapted for gas exchange?
- moist surface, large surface area, good carbon dioxide supply
- good blood supply, moist surface, large spherical surface area, very thin walls
- good blood supply, moist surface, good oxygen supply
7. how dos the oxygen and carbon dioxide get into and out of your blood stream?
- diffusion
- osmosis
- active transport
8. why is the lining of the small intestine folded?
- to create a large surface area
- for growth
- so respiration takes place easier
9. what are the adaptations of the villi?
- large surface area, rich blood supply, moist surface, thin walls
- thin walls, moist surfaces, good blood supply
- large surface area, good blood supply
10. how do amino acids, glucose and fatty acids from the gut get into the blood stream?
- osmosis
- active transport
- A combination of diffusion and active transport
- respiration
- diffusion alone