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A translucent human body diagram showing glowing brain, pancreas, and intestines, with labeled pathways for insulin and glucagon regulation.

La régulation de la glycémie constitue un processus fondamental pour le maintien de l’homéostasie glycémique, en assurant un apport continu en glucose aux cellules, notamment à celles du cerveau et des muscles, dont l’activité en dépend étroitement. Chez l’Homme, la concentration sanguine en glucose est maintenue entre 0,7 et 1,1 g/L grâce à une régulation fine impliquant plusieurs organes et signaux hormonaux. Toute altération de ces mécanismes peut entraîner des conséquences majeures : une diminution excessive de la glycémie provoque une hypoglycémie, délétère pour les tissus dépendants du glucose, tandis qu’une élévation excessive conduit à une hyperglycémie, aux effets nocifs à long terme sur de nombreux organes. Parmi les principaux régulateurs, le pancréas joue un rôle central en ajustant la sécrétion d’insuline et de glucagon selon les besoins énergétiques de l’organisme. Toutefois, cette régulation ne dépend pas uniquement des signaux pancréatiques : des médiateurs intestinaux, appelés incrétines, participent également à ce contrôle métabolique. Les incrétines sont sécrétées en réponse à l’ingestion d’aliments, ces hormones stimulent la sécrétion d’insuline et modulent la glycémie. Leur implication dans le dialogue entre l’intestin et le pancréas souligne ainsi l’importance du système incrétine, médiateur clé du contrôle glycémique. Ver más

#biology #anatomy #medical illustration

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