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71. What is neuro receptor synapse ?

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72. What are neurotransmitters ?

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73. What is the speed of nerve impulse in human beings ?

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74. What leads to the depolarisation of the membrane of the nerves ?

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75. Blind spot in the eye is devoid of ability of vision. Why is it so ?

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76. The action potential is also known as?

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77. What is the primary function of myelin sheath?

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78. State the difference between white and grey matter.

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Functions :

The medulla contains the control the foloowing things

(a)It controls the rate and depth of breathing.

(b) It controls the rate of heart beat.

(d) It controls the act of swallowing.

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80. Mention the general functions of nervous system.

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