Pancreatic cells, TEM

Pancreatic cells, TEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Pancreatic cells. Coloured transmission electron micrograph (TEM) of an acinar (exocrine) pancreatic cell (blue) adjacent to an hormone- secreting (endocrine) Islet of Langerhans cell (green). Acinar cells secrete zymogens (inactive digestive enzymes) in vesicles called zymogen granules (large purple blobs, left), which then become activated when in the small intestine. Islet of Langerhans cells regulate blood sugar levels by secreting hormones such as insulin and glucagon, that are also transported out of the cell by granules (small blue dots, right). The large orange bodies (centre right and top right) are nuclei and the small brown organelles seen throughout are mitochondria.

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Keywords: acinar, anatomical, anatomy, biological, biology, blood sugar, cell, coloured, digestion, digestive enzymes, exocrinenucleus, false-coloured, glucagon, human body, insulin, islets, langerhans, micrograph, mitochondria, organelle, organelles, pancreas, pancreatic, tem, transmission electron, transmission electron microscope, zymogen

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