The best replacement for action potential is graded potential.

The best alternatives to action potential are rated as following:

★★★★★	graded potential
★★★	resting potential
★★★	synaptic potential
★★	nerve impulse
★★	receptor potential
★★	membrane potential
★★	local potential
★★	epsp
★★	postsynaptic potential
★★	depolarization
★	compound action potential
★	ecg
★	end plate potential
★	action potential
	synaptic transmission
	local response
	impulse
	graded potentials
	graded response
	muscle contraction
	biphasic
	generator potential
	simple depolarization
	skeletal
	muscle action potential
	nerve action potential

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Speaking about action potential, one probably shouldn't forget about sodium potassium pump.

Other search terms related to action potential and their ratings are:

★★★★★	sodium potassium pump
★★	graded potential

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Google Trends

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action potential

graded potential

resting potential