Across
- 2. Traps dust and germs in the nose, trachea and bronchi
- 4. Air sacs in the lungs
- 5. The throat
- 8. Sheet of muscle at the base of the rib cage
- 11. Flap of tissue that covers the trachea when swallowing food and drink
- 12. Warms and filters inhaled air
- 13. Voice box
- 14. Muscles between the ribs
- 15. Burning food in our cells using oxygen to provide energy
Down
- 1. Wind pipe
- 3. Movement of molecules from a region of high concentration to a region of low concentration
- 6. Makes up 79% of air
- 7. Blood vessels that surround air sacs in the lungs
- 9. Oxygen binding protein in red blood cells
- 10. Protects the lungs and heart