The junction between two neurons is called .......

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:

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

Which of the following does not act as a neurotransmitter?

The parasympathetic nervous system functions through the secretion of which substance?

The gap between the axon of one neuron and the dendrite of another is called . . . . . . .