As the graded potentials continue to grow stronger they have the potential to depolarize the membrane past its threshold. Graded potentials produced by interactions between neurons at synapses are called postsynaptic potentials PSPs. Log In Medical Knowledge Science Biology Nervous System Anatomy Depolarizing are called EXCITATORY POSTSYNAPTIC POTENTIALS EPSPs. . The main difference between graded potential and action potential is that graded potentials are the variable-strength signals that can be transmitted over short distances whereas action potentials are large depolarizations that can be transmitted over long distances. Tap card to see definition. A depolarizing graded potential at a synapse is called an excitatory PSP and a hyperpolarizing graded potential at a synapse is called an inhibitory PSP. Click card to see definition. A depolarising graded potential at a synapse is called an excitatory PSP and a hyperpolari
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