KEITH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY KEITH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Pancreas. Light micrograph of pancreas tissue, showing Islets of Langerhans. The pancreas is both a digestive (exocrine) gland and a hormone secreting (endocrine) gland. At upper left, groups of pale cells form Islets of Langerhans. Islets of Langerhans are the endocrine secreting regions, in which alpha and beta cells produce the hormones glucagon and insulin respectively. Insulin is essential for metabolism of blood sugar. At right, darker staining cells are arranged in glandular clusters (acini). These cells secrete digestive enzymes which enter the duodenum of the intestine. Magnification: x400 at 35mm size.
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