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Biology
Question

Select the correct statement regarding the Schwann cells.
  1. Surround axon of myelinated nerve fibre
  2. Support muscle fibres
  3. Found in Haversian system of bones
  4. Form basement membrane of epithelium.

A
Support muscle fibres
B
Found in Haversian system of bones
C
Form basement membrane of epithelium.
D
Surround axon of myelinated nerve fibre
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Solution
Verified by Toppr

A Schwann cell forms a myelin sheath by wrapping its plasma membrane concentrically around the axon of nerve cells.
Nerves having myelin sheath are called myelinated neurons.
So, the correct answer is option A.

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Similar Questions
Q1
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 cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres
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Q2
Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.
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Q3
Consider the following statements and state true or false.
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.
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Q4
Assertion:
A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

Reason:
An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

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Q5
Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which from the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.
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