Islets of Langerhans

Numéro d’image : 12028256
Islets of Langerhans
The islets of Langerhans are groups of specialized cells in the pancreas that make and secrete hormones. There are five types of cells in an islet: alpha cells (blue) that make glucagon,which raises the level of glucose (sugar) in the blood; beta cells (yellow -- shown in crossection) that make insulin; delta cells (purple) that make somatostatin which inhibits the release of numerous other hormones in the body; and PP cells and D1 cells,about which little is known. Insulin molecules are shown as green spheres; glaucagon molecules as blue spheres and glucose molecules as grey spheres. Insulin and glucagon can be seen entering the blood stream through the walls of capillaries. Degeneration of the insulin-producing beta cells is the main cause of type I (insulin-dependent) diabetes mellitus
Licence : Droits gérés
Crédit: Science Photo Library / Carol and Mike Werner
Taille de l’image : 6060 px × 4040 px
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