Across
- 3. expand and contract with breathing
- 4. respiratory waste product
- 5. oxygen is swapped for carbon dioxide in the alveoli
- 7. Takes in oxygen and expels carbon dioxide
- 9. small blood vessels surrounding alveoli
- 10. small tubes that branch off from the trachea
Down
- 1. smallest forms of the bronchi in the lungs
- 2. comes from the air, combines with nutrients
- 6. tiny air sacs; there are 600 million in our bodies!
- 8. long tube that carries air to and from the lungs