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 light from distant or near objects by altering the shape of the lens. This is called accomodation
      • to focus on the distant objects the ciliary muscles relax, and the suspensory ligaments tighten, so the lens has a less rounded shape.
      • To focus on near objects, the ciliary muscles contract and the suspensory ligaments slacked, so the lens regains a more rounded shape due to it elasticity
    • Faults in vision
      • Red-green colour blindness is cause by a lack of specialised cells in the retina
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