Heart and Blood Vessels Crossword

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Across
  1. 2. The smallest blood vessel where gas exchange occurs.
  2. 5. A blood vessel that returns blood to the heart.
  3. 6. A cell fragment that helps with blood clotting.
  4. 9. The vessel that brings oxygenated blood from the lungs to the heart.
  5. 11. The inner lining of the heart chambers.
  6. 12. The artery that carries deoxygenated blood from the heart to the lungs.
  7. 14. A white blood cell that helps fight infection.
Down
  1. 1. The muscular middle layer of the heart wall.
  2. 3. The largest artery that carries oxygen-rich blood from the heart to the body.
  3. 4. The lower chamber of the heart that pumps blood out.
  4. 5. The largest vein in the body that returns blood to the heart.
  5. 7. A blood vessel that carries blood away from the heart.
  6. 8. The membrane that surrounds and protects the heart.
  7. 10. The upper chamber of the heart that receives blood.
  8. 13. A red blood cell that carries oxygen throughout the body.