Across
- 1. tubes which carry blood
- 3. organ which pumps blood around the body
- 8. system the heart and blood vessels make up
- 10. bottom chambers of the heart
- 12. type of blood cell that fights infections
Down
- 2. tool used by doctors to measure heart rate
- 4. type of blood cell
- 5. when your heart pumps blood it is said to...
- 6. a gas carried in blood
- 7. stop blood flowing back
- 9. top chambers of the heart
- 11. blue whale heart is the size of a small...