NEET Biology question
Which statements are wrong? I. Synaptic cleft of neurons secrete adrenaline. II. Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. III. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon. IV. Spinal cord and cranial nerves are made of non-myelinated nerve fibres. Of the four statements,
Answer: (D)
Solution
Statement I is wrong because the synaptic cleft itself does not secrete neurotransmitter (it is the pre-synaptic neuron that releases it, and not specifically adrenaline at most synapses); statement IV is wrong because spinal and cranial nerves are
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