Across
- 2. Tissue flap in veins that prevent back-flow of blood
- 5. Most common type of blood cell that transports oxygen and Carbon Dioxide
- 6. Tubes that carry air from the throat to the lungs
- 7. Thin-walled air sacks that are surrounded by capillaries
- 12. Blood vessels that carry un-oxygenated blood
- 13. One-cell thick blood vessels that acts as a transfer station
- 14. Thick-walled blood vessels that carry oxygenated blood
- 15. Exchange of gas between the blood and the body cells
Down
- 1. Blood cells that help the body fight bacteria
- 3. Another name for the throat
- 4. The clear, yellowish, fluid part of the blood
- 8. The organ in which gas exchange takes place
- 9. Exchange of gas between the air and the blood
- 10. Cell fragments that clot the blood
- 11. Hairlike structure found in the nose to catch foreign materials trying to enter the nose