Heart

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Across
  1. 3. The wall dividing the left and right sides of the heart
  2. 5. Artery The vessels supplying blood to the heart muscle itself
  3. 6. The main artery that carries blood away from the heart
  4. 8. The upper chamber of the heart that receives blood
  5. 10. The muscular middle layer of the heart wall
  6. 12. The inner lining of the heart chambers
Down
  1. 1. Vein The vessel carrying oxygenated blood from the lungs to the heart
  2. 2. The lower chamber of the heart that pumps blood
  3. 4. The outer layer of the heart wall
  4. 7. The protective sac surrounding the heart
  5. 9. Artery The vessel carrying deoxygenated blood from the heart to the lungs
  6. 11. The structures that prevent backflow of blood in the heart