Read the given statements and select the correct option. (i)Synaptic cleft of neurons secreates 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. a, b, c - correct, d - incorrectB. c, d - correct, a, b - incorrectC. a, b - correct, c, d - incorrectD. b, c - correct, a, d - incorrect

Read the given statements and select the correct option. (i)Synaptic c

1.	Read the given statements and select the correct option. (i)Synaptic cleft of neurons secreates 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. a, b, c - correct, d - incorrectB. c, d - correct, a, b - incorrectC. a, b - correct, c, d - incorrectD. b, c - correct, a, d - incorrect
Answer» Correct Answer - D Synaptic cleft of neurons secrete acetylcholine. Spinal cord and cranial nerves are made of myelinated nerve fibres.