Question

Read the given statements and select the correct option (i) Synaptic cleft of neurons secretes 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 (iv) Spinal and cranial nerves are made of non myelinated nerve fibres

• A. Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
• B. Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
• C. Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect
• D. Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect

Answer 1

The Correct Option is D

Synaptic vesicles of the synaptic knob secrete neurotransmitter (e.g., adrenaline). Spinal nerves and cranial nerves are myelinated nerves