Calcitonin secretion is stimulated by

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(D) Calcitonin is a peptide hormone secreted by the parafollicular cells ($C$-cells) of the thyroid gland.Its primary function is to lower blood calci

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Hypercalcemia

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(D) Calcitonin is a peptide hormone secreted by the parafollicular cells ($C$-cells) of the thyroid gland.Its primary function is to lower blood calcium levels when they become too high.Therefore,when blood calcium levels rise above the normal range,a condition known as $Hypercalcemia$,the thyroid gland is stimulated to secrete calcitonin.Calcitonin acts by inhibiting osteoclast activity in bones and increasing calcium excretion by the kidneys,thereby restoring calcium homeostasis.

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Assertion: Hormone calcitonin has an antagonistic effect to that of parathormone.
Reason: Calcitonin decreases blood calcium level while parathormone increases blood calcium level.

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