What is the precursor of vitamin D made in response to UV light?

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Question restatement: What is the precursor of vitamin D made in response to UV light?
Options: calcitonin, cholesterol, calcium, PTH

Option 1: calcitonin. This is a peptide hormone produced by the thyroid that helps regulate calcium levels, but it is not a precursor to vitamin D and has nothing to do with UV-driven synthesis.

Option 2: cholesterol. In the skin, 7-dehydrocholesterol (a derivative of cholesterol) is converted to previtamin D3 by UVB radiation from sunlight, which is then thermally isomerized to vitamin D3. This makes cholesterol a foundational precursor in the vitamin D synthesis pathway.

Option 3: calcium. Calcium is a mineral whose serum levels are influenced by vitamin D, but it is not the molecular precursor that UV light acts upon to start vitamin D production.

Option 4: PTH (parathyroid hormone). PTH regulates calcium and phosphate metabolism and can be affected by vitamin D status, but it is not the UV-initiated precursor to vitamin D synthesis.

Putting this together, the UV-driven step in vitamin D production begins with a steroid-related molecule derived from cholesterol, which is 7-dehydrocholesterol, leading to vitamin D formation. The incorrect options fail to represent the initial substrate or driver of the UV-induced process.

Fal25_NUTR011_78664 Quiz - Minerals, H20 & Nutrients Involved in Bone Health

What is the precursor of vitamin D made in response to UV light?

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