Across
- 4. Tube that connects the throat to the lungs
- 5. Membrane surrounding the lungs
- 8. Vessels that surround alveoli
- 11. Gas essential for life, inhaled from air
- 13. Gas removed during exhalation
- 15. System responsible for breathing
- 17. Main muscle used in breathing
- 18. Tiny sacs in the lungs where gas exchange happens
- 20. Voice box; located at the top of the trachea
Down
- 1. Chronic disease that narrows airways
- 2. Hair-like structures that filter air
- 3. The process of taking in oxygen and releasing carbon dioxide
- 6. Tube shared by respiratory and digestive systems
- 7. Larynx is also called the box
- 9. Main respiratory organs
- 10. Breathing in
- 12. Protects the lungs
- 14. Air enters the body through this
- 16. Flap that prevents food from entering the trachea
- 19. EXCHANGE Movement of oxygen and carbon dioxide