The joint between the axon of a neuron and the dendrite of the next is called:

True about electrical synapses:
$(I)$. Pre and postsynaptic neurons are in very close proximity.
$(II)$. Pre and postsynaptic neurons are separated by a synaptic cleft.
$(III)$. Impulse transmission is very fast.
$(IV)$. Electrical synapses are common in our system.
Select the correct option.

Which one of the following does not act as a neurotransmitter?

Branched ends of nerve cells are called telodendria,which establish functional contact with other nerve cells. This connection is called:

The following figure shows the structure of a neuron. Which of the following parts contains neurotransmitters?

Identify the labelled parts $A, B$ and $C$ from the given diagram.