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Across
  1. 4. What your body releases to start chemical digestion.
  2. 9. A skeletal system that is made up of bones inside the body.
  3. 10. Helps move the bones of the skeletal system.
  4. 13. The water level of your body.
  5. 14. This system allows the digestion of food and absorbing of nutrients in your body.
  6. 17. This system transports chemicals and oxygen throughout your body.
  7. 18. _______________ nervous system. This system includes your brain and spinal cord.
  8. 19. The organ that organizes all the signals in the nervous system.
  9. 21. This system is responsible for exchanging gases with the environment.
  10. 23. Animal exchange gases through their moist _________________________.
Down
  1. 1. The system that works to protect you from diseases and illnesses. It also has no major organs.
  2. 2. These chemicals are created by the endocrine system.
  3. 3. The cells that make up the peripheral nervous system.
  4. 5. The stable environment of your cells that allows a cell to live.
  5. 6. These are found in closed circulatory systems.
  6. 7. This process creates carbon dioxide that your body uses the respiratory system to get rid of.
  7. 8. The system that makes sure a species survives.
  8. 11. One of the types of muscle tissue in your body. It is located around the heart.
  9. 12. The primary purpose of your muscular system.
  10. 13. This organ provides the pressure to move blood through your body.
  11. 15. The circulatory system carries oxygen to every _______________ in your body.
  12. 16. You have two of these and they are where your body exchanges gases with the circulatory system.
  13. 20. The core organ in the excretory system (I also taught it as part of the digestive system).
  14. 22. Protection and _______________ are the two primary functions of the skeletal system.