The Respiratory System
Across
- 5. what we breathe out
- 8. found at the end of the trachea
- 10. organ that collects air
- 11. small air tubes
- 12. when gas is exchanged between the alveoli and lung capillaries
Down
- 1. any of the fine branching blood vessels
- 2. pipe that sends air to lungs
- 3. muscle that inflates and deflates the lungs
- 4. What we use to breathe
- 6. each of a series of slender curved bones
- 7. Smelling source
- 9. tiny air sacs at the end of the bronchioles