Which of the following is regarded as a unit of nervous tissue?

Identify $P, Q,$ and $R$ in the given neuron.

In the diagram of a multipolar myelinated neuron given below,different parts have been indicated by alphabets. Choose the option in which these alphabets have been correctly matched with the parts they indicate.

Four healthy individuals suffer an injury at the age of $20$ years,which results in the damage and death of some cells. Which of the following cells will show the least amount of regeneration?

Nissl granules are absent in which part of the neuron?

Cell bodies or cyton are found in