[Campbell Biology P.1060] The activation of vitamin D, which is crucial for calcium homeostas... | Practice Question

The activation of vitamin D, which is crucial for calcium homeostasis, involves a precursor obtained from food or skin. Which organs are primarily involved in the conversion of this precursor to active vitamin D, as described in the text?

  • A: Stomach and pancreas.
  • B: Liver and kidneys.
  • C: Thyroid and parathyroid glands.
  • D: Adrenal glands and intestines.

Explanation

The text states that the 'Conversion of this precursor to active vitamin D begins in the liver. PTH acts in the kidney to stimulate completion of the conversion process.' Therefore, the liver and kidneys are the primary organs involved.