Which of the following neurotransmitters is the principal excitatory neurotransmitter in the central nervous system?

Which neurotransmitter is mainly synthesized in the substantia nigra and plays a key role in movement control?

Glycine acts as an inhibitory neurotransmitter in the spinal cord by opening which type of ion channels?

Serotonin (5-HT) is synthesized in the brain from which amino acid?

Which neurotransmitter is stored in hypothalamic neurons and is involved in regulation of wakefulness and appetite?