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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.

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Long Answer Type

106. Explain the following processes

(c) Conduction of a nerve impulse along a nerve fibre.

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Short Answer Type

107. Name different disorders of eye.

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108. Comment upon the term ‘windows’ present in human ear.

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109. What causes giddiness when a person spins his body rapidly ?

When a person spins his body rapidly, the endolymph goes to one side and strong impulses from semicircular canal are sent to the brain. When the the spinning is stopped the endolymph keeps moving due to inertia. This movemnt of the endolymph signals the brain that the body is still moving. While the eyes signal the brain that the movemnet has stopped. Thus the confusion of the sense and the signals makes the person feel giddy.

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110. Which parts of the nervous system participate in the maintenance of balance & coordinated body movements ?

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