Calcitonin is antagonist_______________?
Correct answer: D. Parathyroid hormone
- A. Serotonin
- B. Thyroxine
- C. Triidothyronine
- D. Parathyroid hormone
Explanation
Calcitonin lowers blood calcium mainly by inhibiting osteoclast-mediated bone resorption, opposing the calcium-raising action of parathyroid hormone. Thyroid hormones and serotonin are not its principal physiological antagonists.
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