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A(n) [“action potential”, “muscle twitch”, “contraction”] consists of a wave of depolarization that moves along the plasma membrane of a neuron or a muscle fiber. This wave of depolarization is immediately followed by repolarization.
Depolarization is when the cell’s membrane potential becomes more [“resting”, “negative”, “positive”] .
Depolarization occurs when calcium channels open in the plasma membrane.
Repolarization is when the cell’s membrane potential becomes more [“resting”, “positive”, “negative”] , returning the cell to its resting potential.
Repolarization occurs when [“calcium”, “sodium”, “potassium”] channels close and [“sodium”, “calcium”, “potassium”] channels open.
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