Q.

What is the name of the fatty substance that makes up a sheath surrounding some axons?

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a

Schwann cells

b

Nodes of Ranvier

c

Myelin

d

Neurilemma

answer is C.

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Detailed Solution

The myelin sheath is a lipid and protein covering that surrounds the axon. Myelinated nerve fibres are surrounded by Schwann cells, which form a myelin sheath around the axon. It allows electrical impulses to transmit quickly and efficiently along the nerve cells.

Hence, the correct option is myelin sheath.

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