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

The correct option is B:
Explanation of the correct option:
Thyrocalcitonin secreted by the parafollicular cells of the thyroid gland is a polypeptide hormone released when the concentration of blood calcium level is higher than the normal level.
Thyrocalcitonin is secreted to lower the blood calcium concentration.
It increases the absorption of calcium in the bone and reduces the absorption of calcium in the kidneys and the intestine and thereby lowers the blood calcium level.
Final answer: Produced by parathyroid, decreases Ca in ECF

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