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Lors de la production d'un potentiel d'action d'une cellule cardionectrice :A. L'ouverture des canaux Na+ à voltage dépendantss s'effectue sous l'effet de la repolarisation du cycle précédentB. L'afflux dans la cellule d'ions Ca2+ fait varier le potentiel de membrane de -60mV à -40mV.C La repolarisation se fait grâce à la fermeture des canaux Ca2+ et à l'ouverture des canaux K+ voltage dépendants.D. VraiE. Faux

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