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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

1 and 4 correct while 2 and 3 are incorrect

Text Solution

Verified by Experts

The correct Answer is:
d
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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.

Assertion : Myelinated nerve fibre are enveloped with Schwan cells, which form a myelin sheath around the axon Reason : Unmyelinated nerve fibre is not enclosed by a Schwan cell and hence does not form a myelin sheath around the axon.

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