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What Is a Neuron

Nodes of Ranv...

Question

Nodes of Ranvier are

A

Joints occur between adjacent axons

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B

Axon terminal forms synape with dendrites

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C

Dendrites of one nerve cells to adjacent nerve cells

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D

Non-myelinated areas of myelenated nerve fibre

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Solution

The correct option is D Non-myelinated areas of myelenated nerve fibre
Node of Ranvier are the periodic gaps present in the form of narrow areas in the insulating myelin sheath on the axon of a neuron. At the nodes of Ranvier the cell membrane is exposed i.e is non-myelinated. It has channel proteins that allow ions to enter and exit the cell bringing about the rapid conduction of nerve impulses. Thus the correct answer is option D.

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Q. 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.

Q. Read the following statements:
(i) Saltatory type of present in non-myelinated nerve fibres (axons) only
(ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present
(iii) Nodes of Ranvier of axon is exposed to ECF
(iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier
(v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation
How many of the statements are correct?

Q. Assertion :Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason: This is due to the absence of nissl's bodies in node of Ranvier.

Q. 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

Q. Distinguish between :
Impulse conduction in a myelinated nerve fibre and non-myelinated nerve fibre

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