Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by the degeneration of brain neurons that are involved in movement control and make use of the neurotransmitter:

Explain the process of transport and release of neurotransmitter with the help of a labelled diagram,showing complete neuron,axon terminal and synapse.

Nerve fibres conduct impulses in

Which part of the neuron is responsible for the release of neurotransmitters?

What happens if $GABA$ is released at the 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: