Acetylcholine is:

Which of the following is broken down by the enzyme $Acetylcholinesterase$?

After the transmission of one impulse from the synapse,it cannot transmit another impulse immediately because one of the following chemicals is active there:

How long does the synaptic delay last (in $, ms$)?

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

Which of the following statements is correct regarding electrical synapses?
$I.$ Pre and postsynaptic membranes are in very close proximity at electrical synapses.
$II.$ Electric currents are involved in the transmission of impulses.
$III.$ Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
$IV.$ Impulse transmission is always faster in electrical synapses than across chemical synapses.
$V.$ Electrical synapses are rare in our system.
The correct option is: