Question

the diagram below shows the activation of vitamin d label the forms of vitamin d on the figure. labels ① drop zones reset all 25 - oh vitamin d (calcidiol) 1,25 - di - oh vitamin d (calcitriol) 7 - dehydrocholesterol

Explanation:

Vitamin D activation starts with 7 - dehydrocholesterol in the skin (converted by UVB to Vitamin D₃). Vitamin D₃ (from skin or diet) goes to the liver where it's converted to 25 - OH Vitamin D (calcidiol). Then, in the kidneys, 25 - OH Vitamin D is converted to 1,25 - di - OH Vitamin D (calcitriol), the active form.

Answer:

Skin: 7 - dehydrocholesterol; Liver: 25 - OH Vitamin D (calcidiol); Kidneys: 1,25 - di - OH Vitamin D (calcitriol)