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What is Calcitonin is secreted by: and explain in detail?
Calcitonin is primarily secreted by the parafollicular C cells of the Thyroid gland. It is a hormone secreted in response to elevated blood calcium. It stimulates calcium deposition in bone and calcium excretion by the kidneys, thus reducing blood calcium. Ref: Essentials of Pharmacology By K D Tripathi, 5th, Edition, Page 301; Ganong's Review of Medical Physiology, 22nd Edition, Page 393.