Axon endings release from their synaptic vesicles a neurotransmitter substance known as:

The movement of the nerve impulse across the synaptic cleft is primarily

Which of the following inhibits the enzyme acetylcholinesterase?

The junction of two nerve fibres is called:

Select the incorrect option for electrical synapses.

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.