Body Systems

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Across
  1. 2. which side of the heart does blood come in?
  2. 5. the primary organ of the respiratory system
  3. 7. The biggest muscle in your body.
  4. 9. which lung tends to be smaller
  5. 11. what’s the smallest bone in your body?
  6. 12. which gender tends to have a faster heart rate?
  7. 14. the hardest working muscle.
  8. 15. How many nerve cells does your body have?
  9. 18. how long does it take for a red blood cell to circulate through your body?
Down
  1. 1. a curved, thin muscle sheet under the lungs.
  2. 3. Who can rehabilitate people with nervous system damage?
  3. 4. your body is made of over how many bones?
  4. 5. what’s the longest bone in your body?
  5. 6. What are your muscles made of?
  6. 8. how many parts are neurons made of
  7. 9. which side of the heart does blood leave?
  8. 10. How many types of bones do you have?
  9. 13. How many types of muscles are there?
  10. 16. enclosed bundles of long fibers called axons.
  11. 17. We don’t have to think about breathing because of what?