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Read the following statements.
a) Post-synaptic potentials are either excitatory or inhibitory.
b) Unmyelinated nerve fibres of PNS are devoid of Schwann cells.
c) Neurotransmitters are involved in the transmission of impulses across electrical synapse.
d) Chemical synapses allow two way transmission of impulses.
Find out the correct answer from the options given below.

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a, b and c only

b, c and d only

a only

a and c only

answer is C.

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Detailed Solution

NCERT – XI page – 320
Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

Neurotransmitters are involved in the transmission of impulses at chemical synapses.
Chemical synapses allow only one way transmission of impulses.

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