Question

What is the difference between an inhibitory and an excitatory post synaptic potential?.

Answer 1

An excitatory post synaptic potential has a reversal potential more positive than the action potential threshold, whereas an inhibitory post synaptic potential has a reversal potential more negative than threshold.

Excitatory postsynaptic potentials (EPSP) carry the neuron's potential closer to its volatile threshold. on the other hand Inhibitory postsynaptic potentials (IPSP) change the charge across the membrane to be further from the volatile threshold.

These potentials are also known as graded potential because their size or amplitude is directly proportional to the strength of the triggering event. Example include when large stimulus leads to the generation of a strong graded response and a small stimulus leads to the generation of a weak graded response.

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