Respiratory System
Across
- 4. tiny branches in with the bronchus divides
- 6. little hairlike organelles
- 7. muscle that helps us breathe
- 8. when air leave the lungs
- 9. tiny air sacs in the lung where gas exchange occurs
Down
- 1. sticky substance that helps trap particles and microbes
- 2. wind pipe
- 3. when oxygen enters the lungs
- 5. blood cell cells responsible for carrying oxygen