Which is true of thyrocalcitonin?

Produced by parathyroid; decreases Ca in ECF

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Produced by thyroid, decreases Ca in ECF

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Produced by parathyroid, increases Ca in ECF

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Produced by thyroid, increases Ca in ECF

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Solution

The correct option is B Produced by thyroid, decreases Ca in ECF
Thyrocalcitonin is a polypeptide hormone which is secreted by the parafollicular cells of the thyroid gland when the concentration of the blood calcium is above the normal level in order to reduce the blood calcium concentration. Thyrocalcitonin reduces the blood calcium level by increasing the absorption of calcium in the bone and reducing the absorption of calcium in the kidneys and the intestine.
So, the correct answer is option B.

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