Vitamin D

intracellular cytosolic signal transduction

Choose the non-genomic effect of vitamin D.

in the nucleus.

The vitamin D response element (VDRE) is found

D

A deficiency of which vitamin is commonly associated with rickets?

1, 4, 3, 6

Choose the correct order of the phrases below to explain the response of the body to a decline in serum calcium levels. Choose the BEST answer. 1. Increased release of PTH 2. Decreased release of PTH 3. Increased synthesis of calbindin 4. Increased synthesis of 1,25-(OH)2 D3 5. Increased bone absorption 6. Increased calcium absorption 7. Decreased bone resorption 8. Increased calcium excretion 9. Increased bone resorption

some evidence suggests a protective effect of vitamin D.

If asked about the relationship of vitamin D to autoimmune disease, the best information for a dietetic professional to provide is:

Cow's milk is a reliable source of vitamin D in the food supply.

Imagine you are a nutritionist working in a country other than the U.S. Which is an assumption about vitamin D status that is NOT true?

50

What % of vitamin D from the diet is absorbed?

Greater than

The RDA for vitamin D for people over the age of 70 is _____ the RDA for teenagers.

D

Toxicity of which vitamin is related to increased deposition of calcium in soft tissues?

calcidiol

What form of vitamin D is the major circulating form with a half-life of approximately 3 weeks?

hypercalcemia

What is a symptom of a vitamin D toxicity

D

What vitamin is associated with diminished proliferation and enhanced differentiation of cells, which serves as a basis for its use as treatment of skin diseases such as psoriasis?

cholecalciferol - vitamin D3

Which vitamin D molecule would you expect to see in fortified foods?

D

Which vitamin has as its primary function the maintenance of calcium homeostasis?

Vitamin D

Which vitamin is believed to function like a steroid hormone?

liver, 25-hydroxycholecalciferol

Dietary cholecalciferol must be further hydroxylated in order to be active vitamin D. The first hydroxylation occurs in the _____ to produce _____.

circulating 25-OH cholecalciferol

In assessing the vitamin D status of an individual, which measure would you use?

six

It's a good thing that milk is fortified with vitamin D so that we can consume the RDA if we drink the recommended number of glasses of milk each day. The DRI for 9-69 year olds is 600 IU (15 μg). This equals _____ cups of milk.

cutaneous production of the vitamin reaches a maximum

Sun exposure does not cause hypervitaminosis D because _____.