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

Given below are two statements.
Statement $I$ - In chemical synapse,the rate of transmission of impulse is higher in homeotherms than poikilotherms.
Statement $II$ - In chemical synapse,the synaptic cleft has a width of about $3.8 \ nm$.
In the light of the above statements,select the correct option given below:

What is responsible for the unidirectional transmission of nerve impulses in a neuron?

Synaptic vesicles contain chemicals called

New potential generated in the post-synaptic neuron during transmission of impulse is:

Assertion $(A) :-$ Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
Reason $(R) :-$ Electrical current can flow directly from one neuron into the other across electrical synapses.