Across
- 3. – Substance that keeps alveoli from collapsing
- 4. Pressure – Pressure of a single gas in a mixture
- 5. – Brain control of breathing rhythm
- 7. – Windpipe
- 9. – Organ system responsible for breathing
- 12. – Throat passage behind the nose and mouth
- 14. Tree – Branching airways inside the lungs
- 15. Cavity – Space inside the nose that filters air
Down
- 1. – Main air passages that come from the trachea
- 2. – Small airway branch in the lungs
- 6. – Voice box
- 8. – Tiny air sacs where gas exchange happens
- 10. – Thin surface where gases move between air and blood
- 11. Capacity – Greatest amount of air exhaled after a deep breath
- 13. – Main organs of breathing