The Respiratory System
Across
- 4. bone structure which protects the heart and lungs
- 5. tiny hairs which move in wavelike motion to remove dust and dirt
- 7. taking air into the lungs
- 9. muscle located under the lungs
- 13. letting air out of the lungs
Down
- 1. covered in cartilage for protection
- 2. tube which leads from trachea to each lung
- 3. membrane that allows the lungs to move easily during ventilation
- 6. main organ of the respiratory system
- 8. also known as the voice box
- 10. tiny sacs within the lungs where gas exchange occurs
- 11. a substance that warms and moistens the air as well as traps foreign substances
- 12. located at the back of the nose and mouth. Carries both food and air