24 Questions
What is the chemical structure of Vitamin D?
Seco-steroid with one broken ring
Which food item is a poor source of dietary Vitamin D?
Kellog’s Cornflakes (35g)
What is the main function of 1,25-dihydroxyvitamin D?
Increase calcium and phosphorus absorption
What is the primary source of dietary Vitamin D in this text?
Supermilk
What is the significance of 25(OH)D in the body?
It maintains serum calcium and phosphorus levels
What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?
It is converted to preD3 in the skin
What is the primary function of Vitamin D in the body?
Maintain bone health
What is the percentage of Vitamin D status in Ireland based on the text?
75.6%
What is the primary difference between Vitamin D2 and Vitamin D3?
Vitamin D2 is derived from plants, while Vitamin D3 is derived from animal sources
What is the primary function of 25-hydroxyvitamin D in the body?
Regulating blood calcium and phosphorus levels
What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?
It is converted to preD3 in the skin upon exposure to UVB radiation
What is the main dietary source of Vitamin D listed in the text?
Mackrel
What is the significance of 1,25-dihydroxyvitamin D in the body?
It increases calcium and phosphorus absorption
What is the primary function of Vitamin D in the body?
Regulating calcium and phosphorus levels for bone health
What is the chemical structure of Vitamin D?
Seco-steroid
What is the primary form of Vitamin D synthesized in the skin upon exposure to UVB radiation?
D3
What is the primary difference between Vitamin D2 and Vitamin D3?
Vitamin D3 is more readily metabolized by the liver and is considered to be the more bioavailable form of vitamin D
What is the significance of 1,25-dihydroxyvitamin D in the body?
It helps in the absorption of calcium and phosphorus in the intestines
What is the role of 7-dehydrocholesterol in the synthesis of Vitamin D?
It is the precursor molecule that is converted to pre-vitamin D3 in the skin upon exposure to UVB radiation
What is the primary function of 25-hydroxyvitamin D in the body?
It is the major circulating form of vitamin D and is used to determine vitamin D status
What is the primary source of dietary Vitamin D in this text?
Liver* (lamb)
What is the main function of 1,25-dihydroxyvitamin D?
It regulates parathyroid hormone (PTH) secretion
What is the chemical structure of Vitamin D?
Vitamin D has a seco-steroid structure with a broken ring
What is the significance of 25(OH)D in the body?
It is used as a biomarker to assess vitamin D status
Test your knowledge of vitamin D and its role in bone and teeth development with this quiz. Learn about EFSA health claim applications and regulations related to vitamin D.
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