Across
- 3. Contract and with ribs, they rise and increase volume in the thoracic cavity
- 6. contracts for inhalation, relaxes for exhalation
- 9. blind air sacs where gas exchange occurs with capillaries
- 10. chest cavity, from diaphragm to throat
- 12. Protects internal organs
- 13. voice box
- 14. branch from trachea into each lung
Down
- 1. vibrate, as air is forced past, producing sound
- 2. membranes surrounding and protecting lungs
- 4. carries air from pharynx to bronchi of lungs
- 5. warms, moistens and filters air
- 7. top of the larynx and covered by epiglottis when swallowing food
- 8. where food and air cross to enter esophagus and trachea
- 11. move debris laden mucous out of the respiratory system