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POTENTIEL D'ACTION Phase 0: entrée brutale et courte de ______**, puis entrée plus prolongée de Ca2+= changement de polarisation de la MB de -90mV à +___mVPhase 1: brève entrée de Cl-= légère baisse de _____Phase 2: _________= persistance d'entrée du _____= PA stable autour de +___mVPhase3:__________: sortie K+-retour de la cell à un potentiel de MB __________Phase4: retour au potentiel seul: phase courte avec activation des pompes Na-K ATPases (échange NA+-K+)

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