Which nutrient is regulated by the parathyroid glands?

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Multiple Choice

Which nutrient is regulated by the parathyroid glands?

Calcium regulation is the key concept. The parathyroid glands monitor blood calcium and release parathyroid hormone when levels fall. PTH raises calcium by three main actions: it stimulates bone to release calcium, increases calcium reabsorption in the kidneys, and boosts the formation of active vitamin D (calcitriol), which in turn increases intestinal calcium absorption. This coordinated response brings blood calcium back toward normal, which is why calcium is the nutrient regulated by the parathyroid glands. The other options—iron, sodium, and potassium—are controlled by different systems and pathways, not primarily by the parathyroids.

Calcium regulation is the key concept. The parathyroid glands monitor blood calcium and release parathyroid hormone when levels fall. PTH raises calcium by three main actions: it stimulates bone to release calcium, increases calcium reabsorption in the kidneys, and boosts the formation of active vitamin D (calcitriol), which in turn increases intestinal calcium absorption. This coordinated response brings blood calcium back toward normal, which is why calcium is the nutrient regulated by the parathyroid glands. The other options—iron, sodium, and potassium—are controlled by different systems and pathways, not primarily by the parathyroids.

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