Discuss the synthesis and functions of vitamin D.

Vitamin D is a fat-soluble vitamin that plays a critical role in calcium and phosphorus homeostasis, bone health, immune function, and several other physiological processes. The synthesis of vitamin D begins in the skin, where ultraviolet B (UVB) radiation from the sun converts 7-dehydrocholesterol, __________ ______ ___ ______ __________ __________ ________ _____ ________ ___ _______ ____.
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