Cardiovascular System

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Across
  1. 4. lower tip of heart
  2. 5. located on each side of neck
  3. 7. smallest vein
  4. 8. gas enters through lungs
  5. 9. largest vein
  6. 12. vessel that carries blood
  7. 13. upper chamber of heart
  8. 14. inner lining of heart
Down
  1. 1. lower chamber of heart
  2. 2. small blood vessel
  3. 3. gas released by cells
  4. 6. membrane surrounding the heart
  5. 10. contraction of heartbeat
  6. 11. incomplete closer of heart valves
  7. 13. largest artery in the body