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A sustained decrease in circulating Ca levels might be caused by decreased levels of which of the following substances?

A sustained decrease in circulating Ca levels might be caused by decreased levels of which of the following substances? Correct Answer Parathyroid hormone

B The two hormones that are responsible for the maintenance of Ca in the blood are parathyroid hormone and calcitonin. Therefore, eliminate (A2+) and (C). Now review the effects of these hormones. Parathyroid hormone increases Ca2+ in the blood, while calcitonin decreases Ca2+ in the blood. A sustained decrease in circulating Ca2+ levels might be caused by decreased levels of parathyroid hormone.

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