Calcitonin lowers serum calcium by inhibiting which bone cell activity?

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Multiple Choice

Calcitonin lowers serum calcium by inhibiting which bone cell activity?

Explanation:
Calcitonin lowers serum calcium by inhibiting osteoclast-mediated bone resorption. Osteoclasts break down bone and release calcium into the bloodstream; when calcitonin dampens osteoclast activity, less calcium is released from bone, so serum calcium decreases. This hormone acts in opposition to PTH, which promotes bone resorption to raise calcium when needed. Calcitonin’s effects on the gut and kidneys are not the primary mechanism, so it doesn’t meaningfully increase intestinal calcium absorption or promote renal calcium excretion.

Calcitonin lowers serum calcium by inhibiting osteoclast-mediated bone resorption. Osteoclasts break down bone and release calcium into the bloodstream; when calcitonin dampens osteoclast activity, less calcium is released from bone, so serum calcium decreases. This hormone acts in opposition to PTH, which promotes bone resorption to raise calcium when needed. Calcitonin’s effects on the gut and kidneys are not the primary mechanism, so it doesn’t meaningfully increase intestinal calcium absorption or promote renal calcium excretion.

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