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