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Neural Control and Coordination

Long Answer Type

101. Discuss about photoreceptors.

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Short Answer Type

102. Name the different muscles controlling the movement of eyeballs and their functions.

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103.

Explain the following processes:

(a) Polarisation of the membrane of a nerve fibre.

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104. How does vitamin A deficiency affect the vision in humans ?

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105. Explain the following processes

(b) Depolarisation of the membrane of a nerve fibre.

Depolarisation of the membrane of a nerve fibre :

During an electrical stimulus the action potential is generated. The membrane becomes permeable to sodium ions than to potassium ions. Thus an outer side membrane has –ve charge and on inner side it gets +ve charge. Hence, the membrane is said to be depolarized.

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