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This document discusses fat soluble vitamin D, including its forms, synthesis in skin upon sunlight exposure, absorption, transport, metabolism to its active form calcitriol in the liver and kidneys, functions in regulating calcium absorption and bone mineralization, deficiency diseases like rickets and osteomalacia, and toxicity from overconsumption. Vitamin D is converted to calcitriol, which acts as a hormone by binding to receptors to stimulate calcium transport proteins and bone mineralization. Deficiency causes impaired bone development and mineralization while excess leads to hypercalcemia.


























