Long acting calcium channel act in which pa of action potential?
Phases Characteristics 0 (depolarization) Opening of fast Na channels. 1 (initial repolarization) Closure of fast Na channels & K+ efflux through open K+ channels. 2 (plateau) L - type slow Ca++ channels open & fast K+ channels close. 3 (rapid repolarization) Ca++ channels close & slow K+ channel open. 4 (resting membrane potential) Average around - 90 mv.
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Excitation and Action Potiential