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81. Write a note on different divisions of nervous systems.

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82. Define the term reflex action and discuss its types.

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83.

Discuss the mechanism of reflex action.

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84. What is an action potential ?

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85. Why does the nerve impulse flow more rapidly in myelinated nerve fibres than in the non-myelinated fibres ?

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86. Draw labelled diagram of the following
(d) Ear.

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87. State one difference between the afferent and the efferent fibres.

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Cerebrum	Cerebellum
Largest part of the brain	Smaller than Cerebrum
It controls voluntary movements, and is a seat of will.	It maintains posture and equilibrium.
It is a part of the forebrain.	It is a part of the hind brain.

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89. Describe the main properties of nervous tissue.

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90. Define receptor and classify it.

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