The Heart

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Across
  1. 2. Vessel returning oxygenated blood from the lungs to the heart
  2. 7. Largest artery distributing oxygenated blood from the heart
  3. 8. Chamber receiving deoxygenated blood from the body
  4. 10. Vessel carrying deoxygenated blood from the heart to the lungs
  5. 13. Valve controlling blood flow between right atrium and ventricle
  6. 14. Main pumping chamber sending oxygen-rich blood to the body
  7. 15. Lower chamber pumping blood to the lungs
  8. 16. Conduction center relaying signals from atria to ventricles
  9. 18. Major vein returning blood from the upper body
  10. 19. Arteries supplying blood to the heart muscle
  11. 20. Natural pacemaker initiating heartbeats
Down
  1. 1. Muscular wall dividing the heart’s left and right sides
  2. 3. Thick muscle layer driving heart contractions
  3. 4. Chamber collecting oxygenated blood from the lungs
  4. 5. Vein collecting deoxygenated blood from the heart tissue
  5. 6. Valve regulating blood flow between left atrium and ventricle
  6. 9. Network ensuring rapid, coordinated ventricular contraction
  7. 11. Protective sac encasing the heart
  8. 12. Major vein returning blood from the lower body
  9. 17. Pathway transmitting impulses from the AV node to the ventricles