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Definition. Protein characteristic of the postsynaptic membrane. In a chemical synapse, the postsynaptic membrane is the membrane that receives a signal (binds neurotransmitter) from the presynaptic cell and responds via depolarisation or hyperpolarisation. The postsynaptic membrane is separated from the presynaptic membrane by the synaptic cleft.
- electrical signal in the presynaptic cell is communicated to the postsynaptic cell by a chemical (the neurotransmitter), - separation between presynaptic and postsynaptic membranes is about 20 to 30 nm. - a chemical transmitter is released and diffuses to bind to receptors on postsynaptic side.