Body Systems

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Across
  1. 4. ____________ are networks of tiny blood vessels
  2. 7. The human brain weighs ______ pounds
  3. 8. The ______ is also called the voice box
  4. 11. The lungs and ____________ allow us to breathe
  5. 13. Muscles move body parts by contracting and then ________
  6. 14. ________ is found in the heart
  7. 16. _______ is where most of the body's blood cells are made
  8. 17. Bones are made up of a framework of a protein called ________
  9. 19. air enters the respiratory system through the ____ or the mouth.
Down
  1. 1. The __________________ carries blood from the heart to all the other parts of the body and back again
  2. 2. _________ is the solid, hard outside part of the bone
  3. 3. smooth muscle is also referred to as_________
  4. 5. The ________________ is a short loop from the heart to the lungs and back again
  5. 6. ________is attached by cord-like tendons
  6. 9. The _____ is a big artery that leaves the heart carrying this oxygenated blood centralnervoussystem the brain and the spinal cord are the _________________
  7. 10. The nerves that go through the whole body make up the __________________
  8. 12. The _________ is the largest and most complex part of the brain
  9. 15. Cancellous bone resembles _____
  10. 18. The cells in our bodies need ______ to stay alive