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- Which of the following pairs of terms is correctly matched? Voltage-gated calcium channels : presynaptic cell membrane EPP : action potential Acetylcholinesterase : presynaptic cell membrane Achetylcholine exocytosis : motor end plateFollowing the arrival of an action potential in stimulated cells, synaptic vesicles rapidly fuse with the presynaptic membrane. This happens in less than l ms. What mechanisms allow this process to take place at such great speed?After an action potential, the opening of voltage-gated ________ channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential. disodium potassium calcium chloride acetylcholine