Across
- 4. connect arteries and veins
- 5. we need this gas to make energy from food
- 9. the trachea branches into these two tubes
- 10. breathe in
- 13. a muscle at the bottom of your chest
- 14. grape-like clusters surrounded by capillaries
- 16. one of the most common respiratory conditions in children
- 18. circuit that carries blood from heart to body
- 19. carry blood back to heart
Down
- 1. you do this when something irritates your nose
- 2. scientific name for windpipe
- 3. force the blood exerts on walls of arteries
- 6. you do this when something irritates your throat
- 7. main job of the circulatory system
- 8. circuit that carries blood from heart to lungs
- 11. disease that causes narrowing of arteries
- 12. one of two places where air enters your body
- 15. one of two places where air enters your body
- 16. carry blood away from heart
- 17. proteins that determine blood type