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1. A chemical substance, formed in one organ or part of the body and carried in the blood to another organ or part; depending on the specificity of their effects. Hormones can alter the functional activity, and sometimes the structure, of just one organ or tissue or various numbers of them.
2. A number of hormone's are formed by ductless glands, but secretin and pancreozymin, formed in the gastrointestinal tract, by definition are also hormone's.
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A hormone secreted by the anterior lobe of the pituitary gland.
antidiuretic hormone, ADH
A pituitary hormone that prevents excessive fluid loss.
It is part of the system maintaining a correct salt and water balance in vertebrates which includes any animal (including humans) with a segmented spinal column and a well-developed brain; for example, a mammal, a bird, a reptile, an amphibian, or a fish.