Which statements of the following are true about electrical synapses ?

I) The membranes of pre-and post-synaptic neurons are in very close proximity.

II) These are rare in our neural system.

III) The impulse transmission across this is always faster than that of chemical synapse.

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only I & II

only I & III

only II & III

all I, II & III

answer is D.

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Detailed Solution

At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close proximity. Electrical current can flow directly from one neuron into the other across these synapses. Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon. Impulse transmission across an electrical synapse is always faster than that across a chemical synapse. Electrical synapses are rare in our system.

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