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6. What happens when you breathe in?
- The diaphragm moves down and the ribs move up and out
- The diaphragm moves up and the ribs move in and down
7. Which has less water vapour?
8. What does the moist lining of the alveoli allow to dissolve before it diffuses through the wall?
- Oxygen
- Carbon dioxide
- Blood
9. Which has less oxygen?
10. What do alveoli have so that more gases can be exchanged?
- A good texture
- A good blood supply
- A good wall
- A good shape
11. The large number of alveoli provides a ____________ for gas exchange
- Large surface area
- Thick wall
- Small surface area
- Thin wall
12. What are at the end of the bronchioles?
- Alveoli
- Intercostal muscles
- Ribs
13. What are the organs of gas exchange in humans?
- Bronchus
- Liver
- Lungs
- Heart
14. What happens to the volume of the thorax when you breathe in?
15. On a diagram, what side would your right lung be?
16. What is not the job of the respiratory system?
- To make energy through respiration
- To get oxygen into the blood
- To remove waste carbon dioxide from the blood
17. Which has less carbon dioxide?
18. Inspired air is....
- Air breathed in
- Air breathed out
19. what needs a respiratory system because the diffusion of oxygen through the surface would be too slow?
- Large animals
- Small animals