The hormone insulin, which is produced by the cells of the pancreas, is released into the surrounding extracellular fluid by an energy-requiring process called _____.

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Insulin is released by exocytosis, which is a process by which secretory vesicles fuse with the cell membrane and release their contents into the extracellular fluid. This process requires energy and is regulated by a variety of factors, including glucose levels and hormones like glucagon. Secretion refers to the overall process of releasing a substance from a cell or gland, while emission is a term more commonly used in the context of releasing particles or radiation. Endocytosis is the opposite of exocytosis and involves the uptake of material into a cell by invagination of the cell membrane.

The Hormone Insulin, Which Is Produced by the Cells of the Pancreas