What happens once a neurotransmitter is received by a postsynaptic neuron’s receptors?

They bind and start an action potential in the postsynaptic neutron

Explanation:

Hello,

The neurons communicate and interact at junctions called synapses.At these junctions a neuron can communicate a message to another neuron in another cell.

In chemical synapses, neurotransmitters are released by presynaptic neuron which bind  to the receptors in postsynaptic cell to initiate an action plan. Postsynaptic cell function through temporary summation and spatial summation. The permeability of postsynaptic neuron is changed for ions such as Na⁺. This trigger the action plan to be initiated.

Hope this helps.