IRRITABILITY

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Across
  1. 4. Organ that detects changes in environment
  2. 7. Change in environment that triggers a response
  3. 9. Neuron that connects sensory and motor neurons
  4. 11. Organ that detects smell
  5. 12. Automatic, rapid response to a stimulus
  6. 13. Organ that detects touch, pressure, and temperature
  7. 15. Structure in ear that detects sound
  8. 16. Organ of sight
  9. 17. Nerve cell that transmits impulses
  10. 19. Ability of organisms to respond to stimuli
  11. 20. Chemical that carries signal across synapse
  12. 21. Electrical signal carried by neurons
  13. 24. Neuron that carries impulses from receptors
  14. 27. Structure that detects stimuli
  15. 28. Pathway of a reflex action
  16. 29. Junction between two neurons
Down
  1. 1. Hormone that prepares body for “fight or flight”
  2. 2. Organ that detects taste
  3. 3. System that produces hormones
  4. 5. Layer of eye that detects light
  5. 6. Structure that focuses light on retina
  6. 8. Transparent part of eye that refracts light
  7. 9. Reaction of an organism to a stimulus
  8. 10. Organ or cell that carries out a response
  9. 14. Organ of hearing and balance
  10. 18. Body system that coordinates responses
  11. 22. Neuron that carries impulses to effectors
  12. 23. Chemical messenger produced by glands
  13. 25. Vibrates in response to sound waves
  14. 26. Opening that controls amount of light entering eye