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calcitonin

Pronunciation: kal′si-tō′nin

Definition: A peptide hormone, of which eight forms in five species are known; composed of 32 amino acids and produced by the parathyroid, thyroid, and thymus glands; its action is opposite to that of parathyroid hormone in that calcitonin increases deposition of calcium and phosphate in bone and lowers the level of calcium in the blood; its level in the blood is increased by glucagon and by Ca2+ and thus opposes postprandial hypercalcemia.

Synonym(s): thyrocalcitonin

[calci- + G. tonos, stretching, + -in]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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