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

Nissl's granules in a nerve cell are composed of which of the following,which are currently known as $..........$?

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

Mark the following statements as true/false and choose the correct option from the codes given below:
$I.$ Neuroglial cells are the packing and supporting cells found in the brain and spinal cord.
$II.$ Oligodendrocytes are a category of glial cells that form myelin sheaths around the axon.
$III.$ Microglia provide mechanical support to the neurons.
$IV.$ Astrocytes communicate with one another through potassium channels.

The afferent process of a neuron is known as:

Which of the following is the structural and functional unit of the nervous system?