Question

Which of the following statements is false about 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)	The transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(iv)	Electrical synapses pass an electrical signal between cells with the use of acetylcholine (Ach).
(v)	Electrical synapses are fast rare in our system.

A. (i) and (ii)
B. Only (ii)
C. Only (iv)
D. Only (v)

Answer 1

Hint:
The gap junction is the electrical synapse. An electrical synapse differs from a chemical synapse when it is formed between neurons. Without receptors or decoding units, they permit the current to flow directly from one cell to the next.

Complete answer:
Electrical synapses are present in mammals only in neuroglial cells, which are the primary means of communication. While in invertebrates and non-mammalian nervous systems electrical synapses are present in abundance.
A synapse links a neuron or two neurons with a target or effector cell like a muscle cell. It permits the transmission of electrical and chemical impulses. A synapse transmits nerve impulses from one neuron’s axon terminal to the next neuron’s dendrites. It may be either chemical or electrical in nature.
An electric signal transmission across the electrical synapse is similar to the conduction of impulse in an axon. When presynaptic and postsynaptic neurons are in close proximity that time-gap junctions are formed. In comparison, to chemical synapses, the electrical is less adaptable. At the electrical synapse, the transfer of impulse occurs by purely electrical means without involving any neurotransmitter.
Hence the correct answer is Only (iv)

Option ‘C’ is correct

Note:
During nervous system development the electrical synapse is common. But in adults, it does not present abundance. They are present in a specific location and play an important role in functioning.