General Science • BiologyHard
Which endocrine gland in the human body secretes calcitonin, a hormone that plays a vital role in regulating blood calcium levels by inhibiting osteoclast activity?
A. Parathyroid gland
B. Thyroid gland✓ Correct Answer
C. Adrenal cortex
D. Anterior pituitary gland
💡 Solution & Explanation
Calcitonin is a peptide hormone secreted by the parafollicular cells of the thyroid gland that acts to lower blood calcium and phosphate concentrations by suppressing osteoclast bone resorption and promoting calcium excretion in the kidneys. Conversely, parathyroid hormone secreted by the parathyroid glands elevates blood calcium levels. The thyroid gland is also responsible for producing thyroxine, which regulates basal metabolic rate. Calcium homeostasis is tightly regulated by these antagonistic hormonal mechanisms.
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