Across
- 2. Also called wind pipe
- 5. tubes that carry blood from parts of your body to the heart
- 7. arteries and veins are by networks of very narrow tubes calles__
- 9. The main organ in our circulatory system
- 11. Which gas makes up most of the air you breath in
- 12. A group of similar__ come together to make a tissue
- 13. breath using this part of your body
Down
- 1. Different organs working together
- 3. To stay alive your cells need__
- 4. If body fights diseases
- 6. Balloon like air sacs at the end of the bronchiole
- 7. Germs that spread easily
- 8. Different word for breathing
- 10. Transports blood away from the body