The endocrine system consists of ductless, vascular tissues that release a variety of hormones in regulated fashion. Hormones control or regulate a multitude of biologic processes in virtually all tissues. Endocrine dysfunction is common in species of veterinary importance, and a knowledge of hormone chemistry and mechanisms of action are central to understanding diagnosis and treatment of these diseases.
Steroid hormones are derivatives of cholesterol and include products of the adrenal cortex, ovaries, and testes as well as the related molecule, vitamin D.
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