Across
- 1. Blood cell that protects the body against infection.
- 3. Blood cell that carries O2 and CO2 around the body.
- 6. Middle layer of the heart wall.
- 10. Vein that takes blood back from the lungs to the heart.
- 12. Outermost layer of the heart wall.
- 14. Type of blood vessel where gas exchange occurs.
- 15. Upper two chambers of the heart.
Down
- 2. Innermost layer of the heart wall.
- 4. Type of blood vessel that carries blood away from the heart.
- 5. Main artery of the body that sends the blood it gets from the left ventricle around the body.
- 7. Lower two chambers of the heart.
- 8. Blood cell that clots to prevent bleeding.
- 9. Artery that takes blood from the heart to the lungs.
- 11. Large vein that carries blood from the body to the heart.
- 13. Type of blood vessel that carries blood towards the heart.