RESPIRATORY SYSTEM
Across
- 1. Double layered protective membrane of the lungs
- 4. Taking air into the lungs
- 6. Exhalation of breath from the lungs
- 8. The wind pipe
Down
- 2. Main organ of respiratory system
- 3. Muscle located under the lungs
- 5. Branches of trachea which enters the lungs
- 7. Tiny sacs within the lungs where gaseous exchange occur