Which of the following neurotransmitters acts as an inhibitory neurotransmitter in the central nervous system?

The parasympathetic nervous system functions through the secretion of which substance?

Which of the following inhibits the enzyme acetylcholinesterase?

Arrange the following events in proper sequence during impulse transmission across a chemical synapse:
$(a)$ Fusion of synaptic vesicles with the cell membrane of the presynaptic neuron.
$(b)$ $Ca^{++}$ channels open and $Ca^{++}$ diffuses into the synaptic knob from the extracellular fluid.
$(c)$ Neurotransmitter binds with receptors of the postsynaptic cell.
$(d)$ Release of neurotransmitter by exocytosis.

Which one of the following does not act as a neurotransmitter?

The receptors of neurotransmitters are present on/in the