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Lorsqu'un potentiel d'action se produit au niveau des cardiomyocites :A. Le calcium nécessaire au déclenchement de la contractionmusculaire vient essentiellement du réticulum sarcoplasmiqueB. La sortie des ions K+ s'effectue simultanémant à l'entrée des Ca2+, ce qui prolonge l'état de dépolarisationC. La période réfractaire absolue dure presque aussi lgt que la contraction afin d'empêcher les contractions tétaniques.D. Vrai E. Faux
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