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Nerve Cell

The node of R...

Question

The node of Ranvier on an axon is the

A

points devoid of myelin sheath

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B

short branched processes

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C

fine fibres in the neuroplasm

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D

point of contact between two neurons

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Solution

The correct option is A points devoid of myelin sheath
In some myelinated neurons, there are points on the axon where the myelin sheath is absent. These are called nodes of Ranvier. They help to conduct impulses faster.

Dendrites are the short, branched processes in a neuron which receives the neuronal signal.

The neuroplasm is the cytoplasm present in a nerve cell and contains many fine fibres called neurofibrils.

The point of contact between two neurons is called the synapse. Synapse functions in the transmission of nerve impulses.

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Similar questions

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. 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. 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.

Synapse is the point of contact between the terminal branches of the axon and the dendrites of two different neurons.

Q. The node of Ranvier on an axon is the

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