Which of the following does not act as a neurotransmitter?

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

Which of the following statements is correct regarding electrical synapses?
$I.$ Pre and postsynaptic membranes are in very close proximity at electrical synapses.
$II.$ Electric currents are involved in the transmission of impulses.
$III.$ Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
$IV.$ Impulse transmission is always faster in electrical synapses than across chemical synapses.
$V.$ Electrical synapses are rare in our system.
The correct option is:

Parkinson's disease (characterized by tremors and rigidity in limbs) is caused by the degeneration of neurons in the brain that are associated with the secretion and use of which neurotransmitter?

Which of the following is secreted at the ends of nerve fibres?

$A$ nerve impulse is transmitted from one neuron to another through the junctions called