Across
- 1. the number of valves in the heart
- 4. the organ where blood picks up oxygen
- 8. the two top chambers of the heart
- 9. blood vessels that carry blood away from the heart
- 10. the type of blood with little oxygen in it
Down
- 2. the type of blood with a lot of oxygen in it
- 3. the two bottom chambers of the heart
- 5. blood is never this color
- 6. the structures that make sure blood flows in one direction
- 7. blood vessels that carry blood toward the heart
- 11. the largest artery