Across
- 2. The muscle that helps draw air into the lungs (9)
- 5. Gas needed for respiration (6)
- 6. This artery(unusually has DEoxygenated blood)
- 7. The windpipe that carries air to the lungs (7)
- 10. This vein(unusually has OXYGENATED blood)
- 12. The lower chamber of the heart (9)
- 13. Blood vessels that carry blood back to the heart (5)
- 15. The liquid part of blood (6)
- 17. The protein in red blood cells that carries oxygen (11)
Down
- 1. Tiny blood vessels where substances are exchanged with cells (10)
- 3. Blood vessels that carry blood away from the heart (8)
- 4. The process of releasing energy from glucose in cells (11)
- 8. Tiny air sacs in the lungs where gas exchange occurs (7)
- 9. Organs where gas exchange occurs (5)
- 11. The upper chamber of the heart (6)
- 14. The element found in carbon dioxide (6)
- 16. The organ that pumps blood around the body (5)