Where are synaptic vesicles found?

In the parasympathetic nervous system,which of the following is released?

Identify the location and function of the following structures:
$(1)$ Synaptic Knob
$(2)$ Bipolar nerve cell

The junction of two nerve fibres is called:

Which part of the neuron is responsible for the release of neurotransmitters?

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.