Across
- 2. Taking air into the lungs
- 5. Muscle located under the lung
- 8. Letting air out of the lungs
- 9. Main organ of the respiratory system
Down
- 1. Filters the air we inhale and branches into the windpipe
- 3. tubes Tubes which leads from windpipe to each lung
- 4. Bone structure which protects the heart and lungs
- 6. A substance that moistens the air as well as trapping foreign substances
- 7. Allows air to enter and leave the body