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Pancreatic acinar cell, TEM

Pancreatic acinar cell, TEM

C015/3280

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Credit

STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY

Caption

Pancreatic acinar cell. Transmission electron micrograph (TEM) of a section through an enzyme-secreting acinar cell in the human pancreas, showing the nucleus (dark purple, centre), rough endoplasmic reticulum (ER, green lines, top), and zymogen granules (circles), which contain the inactive forms of digestive enzymes. These enzymes are released from the cell by exocytosis. They pass into the pancreatic duct system and are delivered into the duodenum in the gut, where they are converted into their active state. Various locally acting hormones arising from the gut stimulate the production of this pancreatic enzyme-rich fluid. Magnification: x8000 when printed 10 centimetres wide.

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