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NEET UG BIOLOGY MCQ: NEURAL CONTROL AND COORDINATION
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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 myelin sheath.
IV.Spinal cord and cranial nerves are made of non-myelinated nerve fibres.
Of the four statements,
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 myelin sheath.
IV.Spinal cord and cranial nerves are made of non-myelinated nerve fibres.
Of the four statements,
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Correct option: D
II and III are correct but I and IV are incorrect
Option D (II and III are correct but I and IV are incorrect) is correct because statements II and III accurately describe myelinated and non-myelinated nerve fibers, while I and IV contain inaccuracies about adrenaline secretion and spinal/cranial nerve composition.
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II. It is important in overall activation and arousal
III. It is concerned with involuntary movements
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