all about the heart

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Across
  1. 3. the heart and prevent back flow
  2. 5. the lower Chambers of the heart left and
  3. 9. cycle
  4. 10. the out layer of the heart
  5. 13. relating to the lungs
Down
  1. 1. the inner living of the heart
  2. 2. heart pumps blood around the body
  3. 4. cava
  4. 6. sides of the heart
  5. 7. the wall of muscle seperating the left and
  6. 8. structures of blood that control blood flow
  7. 9. cycle the sequence of events that make up
  8. 11. the main artery carring blood away from the
  9. 12. heart beat