Human Body Systems

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Across
  1. 4. long leg bone
  2. 7. body system that contracts to pull bones
  3. 12. body system that brings oxygen into the body and releases carbon dioxide
  4. 15. groups of cells
  5. 17. connects nerves to the brain and controls reflexes
  6. 19. long top arm bone
  7. 20. tube that connects mouth to the stomach
  8. 21. body system that moves blood oxygen and nutrients throughout the body
  9. 22. muscle with 4 chambers that moves blood through the body
Down
  1. 1. bones that make up the spine in the skeletal system
  2. 2. body system that protects other organs, makes blood cells, and stores calcium
  3. 3. groups of tissues
  4. 5. body system that helps break down food and remove waste from the body
  5. 6. groups of organs
  6. 8. part of the digestive system where blood picks up nutrients
  7. 9. large upper leg muscles
  8. 10. an organ that controls your actions
  9. 11. the smallest building block of living things
  10. 13. body system that controls all other systems and helps you think
  11. 14. upper arm muscles
  12. 16. windpipe
  13. 18. connect to the trachea and exchange gases that we breathe