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COUPLAGE EXCITATION/CONTRACTION Couplage entre l'excitation électrique du potentiel d'action et la contraction mécanique de la fibre myocardique Élément déclencheur de la contraction: changement des concentrations ioniques= __________ brutale de la concentration cytoplasmique de Ca2+*Mécanisme schématique de la contraction: -liaison du Ca2+ à la sous-unité C de la ________*-modif de la ___________ de la tropomyosine -démasquage d'un domaine de fixation sur l'actinie pour la tête de myosine -liaison _______-________**-raccourcissement de l'unité fonctionnelle contractile: le ___________*-contraction de la fibre myocardique -hydrolyse d'un ATP puis retour à l'état de base —> mécanisme complexe et pointu
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