Human Body Systems

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Across
  1. 1. Structures that connect bones to muscle
  2. 3. The major organ of the respiratory system
  3. 5. Structures that connect bones to other bones
  4. 7. The major organ of the skeletal system
  5. 9. System that circulates oxygen throughout the body
  6. 12. The major organ of the nervous system
  7. 14. The number of major organ systems in the body
  8. 16. Muscles that are controlled unconsciously
  9. 17. System that provides support, structure, and protection for the body
  10. 18. A group of organs that work together to perform a specific and complex function
  11. 21. The basic unit of life in the human body
Down
  1. 2. System that obtains energy and nutrients from food
  2. 4. One of the major organs of the digestive system
  3. 6. System that controls the body and its functions and collects sensory information
  4. 8. A part of the body made of tissues that performs a specific function
  5. 10. System that protects the body from infection
  6. 11. The major organ of the circulatory system
  7. 13. System that collects oxygen and removes CO2
  8. 15. Muscles that you have conscious control over
  9. 19. Groups of specialized cells that perform a specific function
  10. 20. System that helps the body and organs move