Across
- 2. Muscle located under the lungs
- 6. Filters the air we inhale and branches into the air tubes
- 7. Tiny sacs within the lungs where gaseous exchange occurs
- 8. A substance that moistens the air as well as trapping foreign substances
- 9. Taking air into the lungs
Down
- 1. Allows air to enter and leave the body
- 3. Tubes which leads from windpipe to each lung
- 4. The process of producing energy using sugar and oxygen
- 5. Bone structure which protects the heart and lungs
- 10. Main organ of the respiratory system