Across
- 5. upper part of the heart
- 6. a collection of tissues working together
- 8. lower part of the heart
- 10. a group of organs working together to create a system
- 12. pathway air takes to the alveoli
- 14. filters your blood
- 15. an organ that exchanges oxygen and carbon dioxide with the blood
Down
- 1. tubes that branch off of the larger bronchi
- 2. a group of cells that perform the same function
- 3. large flat muscle that helps you breath
- 4. small units in the kidney that filter the blood
- 7. tiny sacs in your lungs that exchange the oxygen
- 9. takes blood to the heart
- 11. takes blood away from the heart
- 13. the smallest life form