Across
- 3. Trachea divides into ________.
- 4. The process of taking air into the lungs.
- 7. Tiny air sacs in the lungs where gas exchange occurs.
- 8. The process of releasing air from the lungs.
- 9. The two organs used for breathing.
Down
- 1. The substance that we breathe in during inhalation
- 2. The tube that carries air to the lungs.
- 3. Small branches of bronchi inside the lungs.
- 5. Dome-shaped muscle that helps in breathing.
- 6. Part of the respiratory system where air enters first.