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Question

A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order.
(i) Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron.
(ii) Neurotransmitter binds to the receptor on post synaptic membrane.
(iii) Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft.
(iv) Depolarisation of pre-synaptic membrane.
(v) Arrival of action potential at axon terminal.
Which of the following options represents these events in a correct order?

A
(v)(iv)(iii)(ii)(i)
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B
(i)(ii)(iii)(iv)(v)
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C
(i)(ii)(iv)(iii)(v)
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D
(v)(iv)(iii)(i)(ii)
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Solution

The correct option is A (v)(iv)(iii)(ii)(i)
Arrival of action potential- depolarisation- synaptic vesicles release neurotransmitters- they fuse with dendrites of next neuron- neurotransmitter binds to receptor- voltage gated sodium ion channels open up- sodium ion influx- a new action potential is generated- cycle repeats.
So, the correct option is A.

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