Heart

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Across
  1. 4. has highest pressure
  2. 6. transports blood from the upper body to the heart
  3. 8. transports blood from heart to lungs
  4. 9. ensures the blood does not flow backward
  5. 11. collects blood coming from the lungs
Down
  1. 1. largest vein in humans
  2. 2. transports blood from lungs to heart
  3. 3. largest artery in humans
  4. 5. collects the blood coming from the vena cava
  5. 7. collects blood which comes from the vena cava
  6. 10. diving wall in the heart