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Across
  1. 1. Brings blood from lungs
  2. 2. Heart muscle
  3. 5. Feed heart muscle
  4. 6. Main artery from heart
  5. 10. Heart inner lining
  6. 12. Tiny network of blood vessels
  7. 13. Lower heart chambers
Down
  1. 1. Carries blood to lungs
  2. 3. Upper heart chambers
  3. 4. Carries blood to heart
  4. 7. Carries blood to heart
  5. 8. Immune system gland
  6. 9. Heart’s natural pacemaker
  7. 11. Heart covering