Choose the correct answer from the alternatives given.
Parathyroid hormone (PTH) and calcitonin (CT) control the levels of which of the following ions in blood?

Calcium

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Sodium

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Potassium

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Chloride

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Solution

The correct option is A Calcium
The thyroid gland secretes a protein hormone called thyrocalcitonin (TCT) which regulates the blood calcium levels. Parathyroid hormone (PTH) increases the calcium levels in the blood. It also stimulates reabsorption of calcium by the renal tubules and increases calcium absorption from the digested food.
So the correct answer is calcium.

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