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

In $P$,the membranes of pre-synaptic and post-synaptic neurons are in very close proximity,whereas in $Q$,there is a space between the membranes of pre-synaptic and post-synaptic neurons.
$\quad\quad\quad P\quad\quad\quad Q$

The venom of a cobra affects the $........$ system.

The movement of the nerve impulse across the synaptic cleft is primarily

Which of the following hormones act as neurotransmitters?

$A$ synapse is formed by