Which one of the following is the correct sequence of events that follows in a Synaptic Transmission of Nerve impulse _____.

1. The membrane becomes depolarized

2. Voltage Calcium channels open

3. Release of Synaptic Vesicles

4. Diffusion of neurotransmitter across the synaptic cleft, binding to receptor proteins

on the postsynaptic membrane.

2,1,4,3

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3,2,4,1

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1,2,3,4

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4,1,3,2

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Solution

The correct option is C
1,2,3,4

· When the action potential arrives at the axon terminals, the axonal membrane is depolarised.

· Depolarisation of the axonal membrane causes opening of the voltage gated Ca2+ channels present at the synapse.

· The influx of Ca2+ into the cell causes the synaptic vesicles present at the presynaptic membrane to fuse with the membrane and release the neurotransmitter contained in the vesicle to be released into the synaptic cleft.

· The neurotransmitter then diffuses across the synaptic cleft and binds to the receptors located on the postsynaptic membrane.

Suggest Corrections

Similar questions

Q. 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?

Q. During synaptic transmission of nerve impulse, neurotransmitter P is released from synaptic vesicles by action of ions Q. Choose the correct P and Q

Which one of the following is the correct sequence of events that follows in a synaptic transmission of nerve impulse?

2 $\to$ 1 $\to$ 4 $\to$ 3 $\to$ 6 $\to$ 5
5 $\to$ 6 $\to$ 3 $\to$ 2 $\to$ 4 $\to$ 1
1 $\to$ 2 $\to$ 3 $\to$ 4 $\to$ 5 $\to$ 6
4 $\to$ 6 $\to$ 3 $\to$ 1 $\to$ 5 $\to$ 2

Given below is a randomly arranged list of events that occur at the neuromuscular junction to trigger muscle contraction.Which of the following gives the correct sequence of these steps?

(i) Acetylcholine binds to the receptor sites on sarcolemma

(ii) Nerve impulse

(iii) Release of Ca+2 from sarcoplasmic reticulum

(iv) The neurotransmitter acetylcholine is released

(v) Sarcomere shortens

(vi) Acetylcholine diffuses across the synaptic cleft

(vii) Spread of impulses over sarcolemma on T-tubules

Q. Assertion :A neuron chemically communicates with a myocyte by releasing acetylcholine into the myoneural junction. Reason: Acetylcholine diffuses across the nerve-muscle synaptic-cleft and binds to receptors on the sarcolemma which gets depolarized.

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