Assertion: Hormone calcitonin has an antagoni | vedclass

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(A) Calcitonin (or thyrocalcitonin) is secreted by the parafollicular cells of the thyroid gland. It lowers blood calcium levels by inhibiting bone re

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) Calcitonin (or thyrocalcitonin) is secreted by the parafollicular cells of the thyroid gland. It lowers blood calcium levels by inhibiting bone resorption and promoting calcium excretion in urine.Parathormone $(PTH)$ is secreted by the chief cells of the parathyroid gland. It increases blood calcium levels by stimulating calcium absorption from the intestine,reabsorption from the renal tubules,and bone demineralization.Since calcitonin lowers blood calcium and parathormone raises it,they have antagonistic effects.Therefore,the Assertion is correct,the Reason is correct,and the Reason is the correct explanation of the Assertion.

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