Keeping It Under Control

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Across
  1. 2. type of neurone that transmits information from the central nervous system to effectors
  2. 3. a reaction to something that has happened
  3. 7. type of neurone that transmits information from receptors to the central nervous system
  4. 9. an action that is performed without conscious thought as a response to a stimulus
  5. 13. type of system that detects and responds to changes of its surroundings
  6. 14. a substance used to stimulate immunity to a particular infectious disease or pathogen
  7. 16. growth or movement in plants in response to environmental stimuli
  8. 17. production of immunity by artificial means
  9. 18. organ which can produce a response to environmental stimuli
  10. 19. a detectable change in the physical or chemical structure of an organism's internal or external environment
  11. 20. an illness or sickness characterised by specific signs or symptoms
Down
  1. 1. cell that transmits electrical impulses around the body
  2. 4. type of gland that secretes hormones into the bloodstream
  3. 5. chemical messengers
  4. 6. able to be passed from one person, animal, or plant to another
  5. 8. organ which detects environmental stimuli
  6. 10. main organ of the central nervous system
  7. 11. maintenance of a constant internal environment
  8. 12. a plant hormone that regulates growth
  9. 15. lowest part of the brain that controls the body’s automatic processes