1. Quelle est la caractéristique principale des fibres musculaires striées ?
2. Quelle affirmation correspond au sujet « Composition et organisation des sarcomères dans les myofibrilles » ?
3. Quelle est la cause principale du raccourcissement du sarcomère lors de la contraction musculaire ?
Fibres musculaires — organisation ?
Polynucléées, longues, striées.
Sarcomère — composition ?
Filaments d’actine et de myosine.
Coulissage filaments — mécanisme ?
Glissement relatif d’actine et myosine.
Raccourcissement — transmission ?
Force transmise via tendons.
Muscle squelettique — organisation ?
Faisceaux, fibres, tendons.
Tendons — rôle ?
Relier muscle à os, transmettre force.
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