The pancreas is a gland organ in the digestive and endocrine system of vertebrates. It is both exocrine and endocrine . Under a microscope, stained sections of the pancreas reveal two different types of parenchymal tissue. Lightly staining clusters of cells are called islets of Langerhans, which produce hormones that underlie the endocrine functions of the pancreas. Darker staining cells form acini connected to ducts. Acinar cells belong to the...
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