Which cells stop dividing after birth?

The axon part of the neuron is highly modified for which of the following functions?

Choose the correct statements about Nissl's granules from the codes given below:
$I.$ There are regular masses of ribosomes
$II.$ There are irregular masses of ribosomes and $ER$
$III.$ There are granular bodies
$IV.$ They synthesise proteins in the cell

The efferent process of a neuron is known as:

In a neuron,ion channels are made of $.....P....$ and are located in $.....Q.....$.
$\quad\quad P\quad\quad Q$

The neurilemma surrounds the