the nervous system

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  • the nervous system
    • How does the eye work?
      • The main parts of the eye have special functions
      • Light rays are refracted (bent) by the cornea and lens
      • the retina contains light receptors. some are sensitive to different colours
      • binocular vision helps to judge distance by comparing the images from each eye; the more different they are, the nearer the object
      • the eye can focus the light from the distance or near objects by altering the shape of the lens. this is  called accommodation.
      • to focus on distance objects, the ciliary muscles relax, and the suspensory ligament tighten , so the lens has a less rounded shape.
    • Faults in vision
    • Nerve cells
      • nerve cells are called neurones. nerve impulses pass along the axon
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