Question

The unmyelinated area on a myelinated nerve cell is...
A. Node of Ranvier
B. Synaptic knobs
C. Schwann cells
D. Dendrites

Answer 1

Hint: The unmyelinated area of a myelinated nerve cell is a hole like projection that is present on the nerve cell which regulates the rapid flow of signals from the nerve cells.

Complete answer:
1. Synaptic knobs: Synaptic knobs are the last final tip that presents at the end of the neuron, it is a Bob-like structure that presents on the nerve cell which secret the signals in the form of Neurotransmitters, the most common neurotransmitter is acetyl Co-A.
It further connects with the next cell or muscle cell or brain cells.
2. Node of Ranvier: It is present on the myelinated nerve cell, the area or the gap like structure that presents on the myelinated nerve cell and left unmyelinated that gap is known as the node of Ranvier.
The node of Ranvier promotes the rapid flow of signals from the nerve cell as a result of these unmyelinated areas.
3. Dendrites: Dendrites are the starting tip of the nerve cell, a number of dendrites are present on the nerve cell which collects the signals that are received by the nerve cells from the environment or brain.
4 Schwann cell: The myelinated nerve cell which is not completely myelinated also has some unmyelinated area is known as the Schwann cell.
So the unmyelinated area is known as the node of Ranvier

So, the correct answer is “Option A”.

Note: The nerve cells which conduct signals to the brain are known as sensory nerve cells and the cells that conduct signals from the brain are known as motor cells.
Nerve cells are the longest cell of the body and can not be regenerated if once injured.