[BIOM 3200] - Final Exam Guide - Ultimate 46 pages long Study Guide!

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Lack the ducts that are present in exocrine glands. Secrete their products, (hormones) into the blood, making them different than exocrine, which has glands and ducts. Blood carries the hormones to target cells that contain specific receptor proteins for the hormones, and which therefore can respond to them. Endocrine glands are organs whose primary functions are the production and secretion of hormones. Pancreas can function as both endo and exocrine gland. Hormones secreted by different endocrine glands vary widely in chemical structure. All hormones, however, can be divided into a few chemical classes: amines. are derived from the amino acids tyrosine and tryptophan. Includes the hormones secreted by the adrenal medulla, thyroid, and pineal glands: polypeptides and proteins. Antidiuretic hormone is a polypeptide with 9 amino acids, too small to accurately be called a protein. Insulin blurs the two categories, because it is composed of two ppt chains derived from a single, larger molecule: glycoproteins.