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Which of the following statemetn are cor...

Which of the following statemetn are correct and incorret
1. Synaptic cleft of neurons secrate adrenaline
2. Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon
3. Non- myrlineated nerve fibre is emclosed by a schwann cell that from a myelin sheath.
4. Spinal cord and cranial nerve are made of non-myelinated nerve fibres of the four statemets

A

1, 2 are correct but 3 and 4 are incorrect

B

1, 2 and 3 are correct but 4 is incorrect

C

3 and 4 are correct but 1 and 2 are incorrect

D

2 and 3 are correct while 1 and 4 are incorrect

Text Solution

Verified by Experts

The correct Answer is:
D
* Synaptic cleft of neurons secrete acetylcholine.
* Myelinated neuron is formed by Schwann cells that function as insulator so that nerve impulse jump from node to node.
* Non–myelinated neuron does not form a myelin sheath. Thus it has slower continuous conduction.
* Spinal cord and cranial nerves are made up of myelinated nerve fibres.
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