Across
- 2. The walls of the alveoli are slightly wet to allow for efficient diffusion (5)
- 6. This is the wind pipe (7)
- 8. The substance in red blood cells that carries oxygen (11)
- 11. This muscle contracts when you breathe in to raise the ribs
- 13. Breathing out (10)
- 14. Breathing in (10)
- 15. Sticky substance that traps dust
Down
- 1. The process whereby gases move from a high concentration to a low concentration (9)
- 3. 78% of inhaled and exhaled air is made up of this
- 4. Carbon _______ is a waste product (6)
- 5. The nose cavity is also known as the nasal cavity (5)
- 7. Muscle that flattens during inhalation (8)
- 9. Air sack where gaseous exchange takes place
- 10. Small tube between the broncus and alveoli (11)
- 12. 16% of exhaled air is made up of this