Are pre and postsynaptic neurons associated with each other at electrical synapses?

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Solution

Synapses:
Nerve impulses transmit from one neuron to another, through a junction called synapses.
They are mainly of 2 types- chemical and electrical synapses.
In an electrical synapse, the presynaptic and postsynaptic membranes are very close together. They are actually physically connected by channel proteins forming gap junctions.
However, in chemical synapses chemicals like neurotransmitters play an important role.
Pre and postsynaptic neurons of chemical synapses have more gaps than there are in the case of electrical synapses.
Presynaptic and Postsynaptic neuron:
A neuron that transmits a signal towards a synapse is known as a presynaptic neuron.
A neuron that transmits a signal away from the synapse is referred to as a postsynaptic neuron.
Thus, pre and postsynaptic neurons are associated with each other at electrical synapses.

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Q. Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses.
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon.
(iv) Electrical synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.

Q. Which of the following statements are incorrect?
(i) When an impulse travels along a myelinated neuron, it leaps over the myelin sheath from one node to the next.
(ii) At chemical synapse there is continuity between the presynaptic and postsynaptic neurons provided by the gap junctions.
(iii) Neurotransmitters are chemicals that are released from postsynaptic neuron which interact with specific receptors of presynaptic neuron.
(iv) Neurons releasing acetylcholine are described as cholinergic neurons and those releasing noradrenaline are described as adrenergic neurons.
(v) Refractory period is the period after the transmission of an impulse in a nerve fibre in which membrane of the axon regains its ability to transit impulses.

Q. name of the chemical which is present at the synapse and helps in transferring of electrical impulses from one neuron to other.

Q. Complete the statement by choosing appropriate match among the following

Column I

Column II

(a)Resting potential

i. chemicals involved in the transmission of impulses at synapses.

(b)Nerve impulse

ii. gap between the pre synaptic and post synaptic neurons

(c)Synaptic cleft

iii.electrical potential difference across the resting neural membrane

(d)Neurotransmitters

iv.an electrical wave like response of a neuron to a stimulation.

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