hearing, smell and sight

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Across
  1. 2. meeting point between retina and optic nerve
  2. 5. our _____ detects chemicals in the air.
  3. 6. sends these signals to our brain
  4. 8. coloured part and controls the amount of light entering the eye
  5. 9. light enters our eye
  6. 10. air enters our nose through our _____.
  7. 11. sound waves enter the ear
  8. 13. the _____________ _________ within the nasal cavity detect the odour particles
  9. 15. sounds make it vibrate
  10. 16. focused the light at the back of the eye on the retina
Down
  1. 1. ______ _______ send information along the olfactory nerve to our brain.
  2. 3. help us keep our balance when we move
  3. 4. the sound vibrations into electrical signals in the inner ear
  4. 7. nerve receptors send information along the _________ _____ to our brain.
  5. 12. send information along the optic nerve to our brain
  6. 14. light enters our eye