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Types of Synapse

Question

Chemical transmission of nerve impulses from one neuron to another is by
Adrenaline
Acetylcholine
Dopamine
All of the above

A

All of the above

B

Adrenaline

C

Acetylcholine

D

Dopamine

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Solution

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Neurotransmitters are the brain chemicals that relay signals between neurons. There are two kinds of neurotransmitters viz., inhibitory and excitatory. Excitatory neurotransmitters stimulate the brain. Those that calm the brain and help create balance are called inhibitory. Examples of excitatory neurotransmitters are dopamine, epinephrine and norepinephrine. Examples of inhibitory neurotransmitters are serotonin and GABA. Thus, the correct answer is option D.

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Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
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(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

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