A) Gastrin
B) Calcitonin
C) Glucagon
D) Insulin
Correct Answer: B
Solution :
Calcitonin is a 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells (also known as C-cells) of the thyroid and in many other animals in the ultimobranchial body. It acts to reduce blood calcium \[(C{{a}^{2+}})\], opposing the effects of parathyroid hormone (PTH). It has been found in fish, reptiles, birds, and mammals. Its importance in humans has not been as well established as its importance in other animals, as its function is usually not significant in the regulation of normal calcium homeostasis.
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