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Travaux pratiques __résistance globulaire

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  • November 2, 2023
  • 23
  • 2022/2023
  • Exam (elaborations)
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, L’échange de substances entre les cellules et les milieux
environnants est une fonction essentielle à la vie de la
cellule. Ce passage se fait dans les deux sens à travers la
membrane cytoplasmique.

Certaines substances entrent dans la cellule (aliments, O2 et
autres besoins) et d’autres en sortent (Produits de sécrétion
et autres déchets métaboliques).
Excepté le transport actif, tous les échanges de substances

se font sous l’action du Gradient Électrochimique :
déplacement de la substance du milieu à forte concentration
vers celui où celle-ci est faible (distribution homogène de la
matière dans l’environnement).

, T1 Forte diffusion T2 Faible diffusion T3 Équilibre

La diffusion des molécules se poursuit jusqu’à
l’équilibre du système ( distribution uniforme de part et
d’autre de la membrane).
A ce moment, il y’a autant de molécules
déplacées dans un sens que dans l’autre et en aucun
cas arrêt des mouvements.

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