Human Body Systems

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Across
  1. 4. This system is the first line of defense against disease and injury
  2. 6. This system breaks down food and absorbs nutrients and gets rid of waste
  3. 12. An individual animal, plant, or single-celled life form
  4. 13. Responsible for movement of the body
  5. 14. System consists of brain, spinal cord, and nerves
  6. 15. Smallest structural and functional unit of a living thing
Down
  1. 1. Level of organization made up of cells
  2. 2. This system produces egg and sperm cells, transports and sustains these cells, and nurtures developing offspring
  3. 3. Protects from infection and disease; organs include lymph nodes, spleen, and bone marrow
  4. 5. Takes in oxygen and removes waste gases
  5. 7. This system supports the body, protects organs, and stores calcium
  6. 8. This system transports oxygen and other nutrients to cells and returns CO2 and other waste to lungs
  7. 9. Collection of specialized tissues that perform the same function
  8. 10. Produces hormones to share messages throughout the body
  9. 11. Level of organization made up of organs working together to perform a specialized function