Across
- 2. part of the immune system
- 5. small chamber in the heart
- 7. without oxygen
- 8. the largest artery
- 9. the circuit that takes blood to/from the lungs
- 10. Organ that pumps blood
- 11. part of the blood involved in clotting
- 15. vessels that carry blood to the heart
- 16. large chamber in the heart
- 18. the circuit that takes blood to/from the body
- 20. Organ where oxygen enters the body
Down
- 1. percentage of red blood cells in the body
- 3. the "water" of the blood
- 4. the heart, blood, and vessels
- 6. a waste gas that is expelled through the lungs
- 10. protein that carries oxygen
- 12. vessels that carry blood from the heart
- 13. molecule that cells need to get energy
- 14. flaps that stop blood from going backwards
- 17. contained oxygen
- 19. tiny vessels where oxygen is dropped off