Across
- 1. These blood vessels have valves in them to stop blood flowing backwards
- 2. The energy source for respiration
- 3. Blood vessel that leaves the heart taking blood to the body.
- 7. Blood vessel where the exchange of materials takes place
- 10. The gas produced by respiration
- 11. Carries deoxygenated blood from the heart to the lungs
- 12. Part of the heart that pumps blood around the body (4,9)
- 13. The cells that transport oxygen around the body (3,5,5)
- 15. A product of respiration
Down
- 1. Brings deoxygenated blood back to the heart from the body (4,4)
- 4. Carries oxygenated blood from the lungs to the heart.
- 5. Part of the heart that pumps blood around the lungs (5,9)
- 6. Carries blood away from the heart
- 7. A fatty substance that can block blood vessels leading to heart disease
- 8. The cells that fight infection (5,5,5)
- 9. Carries blood to the heart
- 14. The gas required by respiration