Final answer:
Calcitonin is a hormone that regulates blood calcium levels by stimulating bone calcium absorption and deposition, thereby reducing blood calcium levels.
Explanation:
Calcitonin is a hormone produced by the thyroid gland that helps regulate blood calcium levels. It works by promoting calcium absorption and deposition in bones, thus decreasing blood calcium levels. Calcitonin acts opposite to parathyroid hormone (PTH) in maintaining calcium homeostasis.
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