Across
- 2. The chest cavity that contains the lungs and heart.
- 4. A gas required for cellular respiration.
- 6. The difference in concentration between two areas that causes diffusion.
- 10. The process of breathing air into the lungs.
- 11. The chemical process in cells that releases energy from glucose.
- 12. The movement of particles from an area of high concentration to an area of low concentration.
- 14. Definition
- 16. Tiny blood vessels where the exchange of gases takes place.
- 21. The maintenance of a stable internal environment.
Down
- 1. The main gas in the atmosphere that is not used during respiration.
- 3. The compound formed when oxygen combines with haemoglobin.
- 5. The mechanical process of moving air into and out of the lungs.
- 7. The force exerted by air inside the thoracic cavity and lungs.
- 8. The process of breathing air out of the lungs.
- 9. The form in which most carbon dioxide is transported in the blood.
- 13. The muscles between the ribs that assist with breathing.
- 15. The movement of air into and out of the lungs.
- 17. Tiny air sacs in the lungs where gaseous exchange takes place.
- 18. The red pigment in red blood cells that transports oxygen.
- 19. The height above sea level that affects the amount of oxygen available.
- 20. A sheet of muscle below the lungs that helps with breathing.