In a chemical synapse,the transmission of nerve impulses is mediated by:

Transmission of nerve impulse across the synapse is accomplished by:

The synaptic knob contains $..........$.

The joint between the axon of a neuron and the dendrite of the next is called:

Which of the following statements is incorrect regarding a synapse?

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: