Human Anatomy Crossword

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Across
  1. 4. Nerve sheath
  2. 7. Longest human bone
  3. 9. Throat dangler
  4. 10. Outer skin layer
  5. 11. Nerve that slows your heartbeat
  6. 12. O2-transporting cells; abbr.
Down
  1. 1. Largest human organ
  2. 2. Lung air sacs
  3. 3. The brain is in this system
  4. 5. Arm bone, a bit funny
  5. 6. Prefix meaning “liver”
  6. 8. To breathe, biologically