The functional junction between the axon of one neuron and the dendrite of the next is called

The specific receptors for neurotransmitters in a synapse are present on . . . . . .

The receptor sites for neurotransmitters are present on ..........

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:

Most insecticides affect which system of an insect?

The enzyme required for the conduction of nerve impulses across the synapse is: