Which of the following could be a consequence of increased parathyroid hormone secretion due to vitamin D deficiency?

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Multiple Choice

Which of the following could be a consequence of increased parathyroid hormone secretion due to vitamin D deficiency?

Explanation:
When vitamin D deficiency lowers serum calcium by reducing intestinal calcium absorption, the parathyroid glands respond by increasing PTH secretion—secondary hyperparathyroidism—to try to restore calcium levels. The key consequence in this scenario is the rise in PTH itself as the compensatory mechanism. The other options describe effects that do not align with how PTH works (for example, PTH increases, not decreases, kidney calcium reabsorption; and its effect on intestinal calcium is mediated by vitamin D, which is deficient, so a simple decrease in gut absorption isn’t a direct consequence of higher PTH in this setting).

When vitamin D deficiency lowers serum calcium by reducing intestinal calcium absorption, the parathyroid glands respond by increasing PTH secretion—secondary hyperparathyroidism—to try to restore calcium levels. The key consequence in this scenario is the rise in PTH itself as the compensatory mechanism. The other options describe effects that do not align with how PTH works (for example, PTH increases, not decreases, kidney calcium reabsorption; and its effect on intestinal calcium is mediated by vitamin D, which is deficient, so a simple decrease in gut absorption isn’t a direct consequence of higher PTH in this setting).

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