Final answer:
Vitamin D is synthesized in the skin through a process that starts with cholesterol conversion, which is then converted to Vitamin D3 through exposure to UV radiation, crucial for healthy bones.
Explanation:
Vitamin D synthesis in the skin starts with the conversion of cholesterol to 7-dehydrocholesterol, which is then converted to Vitamin D3 (cholecalciferol) upon exposure to UV radiation. This process is crucial for normal absorption of calcium and phosphorous essential for healthy bones.
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