Couplage excitation contraction Flashcards

1
Q

couplage entre quelle activités ?

A

activité électrique + mécanique => couplage excitation contraction

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2
Q

par quoi est commandée la contraction d’un cardiomyocyte?

A

potentiel d’action

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3
Q

phénomène grâce a un couplage entre

A

le PA, la concentration en Ca intracellulaire et la force de contraction

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4
Q

l’énergie est fournie grâce à

A

l’hydrolyse de l’ATP

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5
Q

calcium possède un role

A

central

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6
Q

composition d’un cardiomyocyte

A

tubule T
réticulum endoplasmique
strie Z

mitochondries

actine et myosine

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7
Q

qu’est ce que les tubules T

A

invaginations tubaires de la mb = entrée et sortie des ions et du calcium

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8
Q

propriétés de l’actine et myosine?

A

protéines

actine va glisser sur les têtes de myosine

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