Describe an action potential and explain why a region of the membrane that is in the absolute refractory period cannot experience another action potential until repolarization is complete. Include the following in your answer: voltage-gated Na channels, voltage-gated channels, activation gate, inactivation gate, threshold voltage, depolarization, repolarization. Describe the events of the chemical synapse and how it generates a graded potential in the postsynaptic membrane. Include the following in your answer: neurotransmitter, synaptic vesicles, voltage-gated Ca’ channels, axon terminal postsynaptic membrane, ligand-gated channels, synaptic cleft, presynaptic membrane. GHA U TAN
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