Across
- 3. something path that can help prevent infections from taking hold.
- 6. something passages that connect the alveoli to the bronchus.
- 7. something transport gas.
Down
- 1. Something that protects the lungs, the heart, etc
- 2. sommething make gas exchange, carbon dioxide and oxygen exchange with each other
- 4. It powers the flow of blood.
- 5. something helps lungs and breathing