HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Pancreas anatomy. Illustration of the pancreatic hormones insulin and glucagon (red arrows) being secreted in the pancreas, an organ located in the abdomen behind the stomach. Insulin plays a vital role in the metabolism of sugar in the blood. The pancreas is at bottom, with the expanded view at top showing the structure of an islet of Langerhans. This consists of A-cells, B-cells, D-cells and acinar cells. The islet is composed of clumps of secretory cells that produce the hormones glucagon and insulin. These cells are endocrine, as the secretions go straight into the bloodstream.
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