Body system lea

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Across
  1. 2. carry blood to the heart
  2. 4. a fiber or a bundle of fibers that transmit impulses to the brain and spinal cord
  3. 7. the process of removing waste from the body
  4. 9. exchange of gasses between your body and the air
  5. 11. the body's bone framework
  6. 14. organs that filter water and dissolves waste from the blood
  7. 15. muscles found in the walls of the heart
  8. 16. carry blood away from the heart
  9. 17. where the bones meet
  10. 18. the process of breaking down food into material the body can use
  11. 20. group of cells or an organ that breaks down a substance
Down
  1. 1. air sacs in the lungs where carbon is exchanged with oxygen
  2. 3. the break in a bone caused by an injury
  3. 5. an organ that produces enzymes to help digestion
  4. 6. when the female egg joins with the male sperm
  5. 8. the openings where air enters the lungs
  6. 10. fluid made in you mouth
  7. 12. specialized nerve cells
  8. 13. strong bands of tissue that attach your muscles to your bones
  9. 19. a windpipe that directs air to the lungs