Across
- 2. Senses change in environment
- 3. clefts Small gaps between pairs of neurones
- 5. A part of the eye that contains the receptor cells and is sensitive to light
- 9. Responds to stimulus by contracting
- 11. An example of a involuntary action
- 14. An action that's decided by ourselves
- 16. A part of the eye located in the front of th lens, containing pigments to absorb light
- 18. A group of receptor cells that responds to spesific stimuli
- 19. Changes in a organism's environment are called receptors
- 20. Vacuoles containing neuro transmitter
Down
- 1. A part of the retina that contains the most receptor cells
- 4. A living thing's system that functions to respond to stimuli
- 6. An action of the body without being consciously aware of it
- 7. The longest fibre in the nervous system
- 8. a layer of fat and protein wrapping the nerver fibre in some animals
- 10. A receptor that are able to distinguish color
- 12. Dilation of the pupils to adjust amount of light entering
- 13. A junction between pairs of nerve cells
- 15. Electrical signals from neurones
- 17. cells A receptor that are sensitive to dim light but not color