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In the Central Nervous System (CNS)

Many inputs from hundreds of other neurons are received by a single neruon which then can form synapses with many thousands of other cells.

Type of Potentials

Among these synapses on a single neuron, some get excited when others get inhibited. In the excitatory synapse, neurotransmitter is released which then causes a small depolarisation within the postsynaptic membrane, naming: excitatory postsynaptic potential (EPSP).

On the other hand, the neurotransmitter which is released from an inhibitory synapse causes a small hyperpolarization called: an inhibitory postsynaptic potential (IPSP) [1].


  1. Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K., and Watson, J.(2005), Molecular Biology of the Cell, 5th edn, Garland.
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