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