Q. Regarding vitamin D metabolism: (Solved)
1. 25-hydroxycholecalciferol is converted to 1,25-dihydroxycholecalciferol in the distal convoluted tubule of the kidney
2. 1,25-dihydroxycholecalciferol receptors can be found in skin
3. when calcium levels are high, 24,25-dihydroxycholecalciferol levels are also high
4. transport in plasma is by binding to haemoglobin
5. formation of 25-hydroxycholecalciferol is tightly regulated
- b. 1,25-dihydroxycholecalciferol receptors can be found in skin