Vitamin D Flashcards
What is another name for vitamin D
Calciferol
what are some general sources of vitamin D
fatty fish, milk, yogurt, cheese
what are some excellent sources of vitamin D
cod liver oil, swordfish, salmon, sardines, tuna, fortified yogurt
what are some good sources of Vitamin D
egg yolk, beef liver
what is 1 IU of vitamin D
1 IU equals 0.025ug vitamin D
what is 1 ug of vitamin D
40IU
What are the two forms of Vitamin D
D2 - Ergocalciferol and D3 - Cholecalciferol
Which form of vitamin D is found within the dermis and epidermis
7-dehydrocholesterol (D3)
How does your body receive Vitamin D from sunlight?
Exposure to the sun absorbes photons, causes B ring to open and creates previtamin D3. Then this rearranges to synthesize cholecalcieferol through thermal isolerization
How is vitamin D digestion
it does not require digestion
where is vitamin D stored
blood, adipose, muscle
Where is vitamin D absorbed
Jejunum and Duodenum
what is the absorption rate of Vitamin D
50%
Describe the metabolism of Vitamin D
In the liver, vitamin D is hydroxylated on the 25th Carbon to make 25-hydroxycholecalciferol. This inactive form travels to blood to the kidneys where they form 1-25 dihydroxycholecalciferol, which is he activated form of the vitamin.
When is PTH released from the kidneys
hen blood calcium concentrations are low
