What neurons are also called association neurons?

The diagram given alongside shows the internal structure of a spinal cord depicting phenomena. Study the diagram and answer the questions:

Name the phenomenon that is depicted in the diagram. Define the phenomenon.

Redraw, complete and label the diagram given below which relates to the reflex arc.

Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined:

Stimulus, Response, Receptor, Effector, Spinal cord

Choose the correct answer from the four options given below:

Which of the following is not a natural reflex action?

Assertion ($\mathrm{A}$): In myelinated nerve fibres, action potentials are conducted at a faster rate.

Reason ($\mathrm{R}$): The myelin present between nodes of Ranvier has concentrated $\mathrm{Na}$ and $\mathrm{K}$ voltage-gated channels.

All the following structures are found in an electrical synapse except

The given figure shows the structure of a neuron. Select the option that correctly identifies the parts labelled as A to E.

Where are Nissl's granules found and what is their nature?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$