Crossoword

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Across
  1. 1. how many parts are in a neuron?
  2. 4. how many bones does a baby have?
  3. 5. you lose a lot of ___ just by breathing
  4. 9. how many blood cells do we lose each second
  5. 10. how many ounces of blood does the average persons heart move per beat
  6. 12. strongest muscle in the body Based on size
  7. 17. how many nerves are in the brain?
  8. 18. connect muscle to bone
  9. 20. muscles are made of muscle
Down
  1. 2. what do blood cells have that carry oxygen?
  2. 3. how long is the entire circulatory system in miles?
  3. 6. Longest bone in the body?
  4. 7. muscles can only
  5. 8. one main part of the nervous system is the ___ nervous system
  6. 11. circulatory system delivers nutrients and___to the body
  7. 13. How many bones does the skeletal system have?
  8. 14. lung capacity of average adult?(liter)
  9. 15. the longest nerve in out body is the ___ nerve
  10. 16. which lung is smaller?
  11. 19. where is the smallest bone?