Across
- 2. Smallest blood vessel where exchange of gases occurs
- 5. Blood vessel that carries blood toward the heart
- 6. Cell fragment that helps with blood clotting
- 9. Blood vessel that carries oxygenated blood from lungs to heart
- 11. Inner lining of the heart chambers
- 12. Blood vessel that carries deoxygenated blood from heart to lungs
- 14. White blood cell involved in immune response
Down
- 1. Muscular layer of the heart wall
- 3. Largest artery in the body
- 4. Lower chamber of the heart that pumps blood
- 5. Large vein that carries deoxygenated blood to the heart
- 7. Blood vessel that carries blood away from the heart
- 8. Protective sac surrounding the heart
- 10. Upper chamber of the heart that receives blood
- 13. Red blood cell responsible for carrying oxygen