Answer Briefly (c) How does the eye regulate the amount of light

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 Multiple Choice QuestionsShort Answer Type

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131. Answer Briefly
(c) How does the eye regulate the amount of light that falls on the retina ?


The amount of light that falls on the retina is cregulated by the change in the diameter of the pupil.  The pupils dilate when the light is low so that more light can reach the retina. The diameter of the pupil decreases when there is bright light so that less amount of light reaches the retina. 

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  • Iris
  • Blind spot 
  • Optic chaisma
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(b) Fore brain.
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137. Explain the following processes:
Tranmission of a nerve impulse across a chemical synapse.
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138.

Compare the following

Central neural system(CNS) and peripheral neural system(PNS).

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139. Compare the resting potential and action potenial.
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