Neurons receive signals through their . . . . . . and send signals to other neurons through their . . . . . . .

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.

Which of the following statements is true?

$A$ neuron is a microscopic structure composed of $.......$ major parts.

The afferent process of a neuron is known as:

Neurons are classified on the basis of