Across
- 2. A dome shaped muscle that helps breathing
- 6. Air sacs in the lungs for gas exchange
- 8. Organs used by fish to breath
- 9. Cells that produce mucus in the trachea
- 10. Organ with hair and used to smell
- 11. Movement of molecules from areas of high concentration to low concentration
- 12. A colourless and odourless gas which is associated with deaths due to faulty boilers
- 13. A major by-product of respiration in man
- 14. Red blood cells
Down
- 1. Tube-like organ made of cartilage which divides to form bronchi
- 3. The process of taking air into the lungs
- 4. Bones protecting the lungs
- 5. Gas which is most prevalent in air
- 7. Blood vessel that carries blood from the heart to the lungs for oxygenation