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Questions and Answers
Which vitamin is formed from 7-dehydrocholesterol in animals?
Which vitamin is formed from 7-dehydrocholesterol in animals?
- Vitamin E
- Vitamin K
- Vitamin D3 (correct)
- Vitamin D2
What is the primary function of vitamin D in maintaining calcium levels in the blood stream?
What is the primary function of vitamin D in maintaining calcium levels in the blood stream?
- Enhancing iron absorption
- Promoting sodium retention
- Stimulating potassium excretion
- Intestinal calcium absorption (correct)
From which source is ergocalciferol (vitamin D2) formed?
From which source is ergocalciferol (vitamin D2) formed?
- Renal calcium reabsorption
- Ergosterol in plants (correct)
- Egg and liver
- 7-dehydrocholesterol in animals
Which vitamin is formed from ergosterol in plants?
Which vitamin is formed from ergosterol in plants?
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What is the role of vitamin D in bone calcium resorption?
What is the role of vitamin D in bone calcium resorption?
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How does vitamin D affect phosphate absorption and reabsorption?
How does vitamin D affect phosphate absorption and reabsorption?
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Study Notes
Vitamin D Formation
- Vitamin D is formed from 7-dehydrocholesterol in animals.
Vitamin D Function
- The primary function of vitamin D is to maintain calcium levels in the blood stream.
Ergocalciferol (Vitamin D2)
- Ergocalciferol (vitamin D2) is formed from this source in fungi.
Vitamin D Formation in Plants
- Vitamin D is formed from ergosterol in plants.
Vitamin D and Bone Calcium Resorption
- Vitamin D plays a role in bone calcium resorption.
Vitamin D and Phosphate Absorption/Reabsorption
- Vitamin D promotes phosphate absorption and reabsorption.
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Description
Test your knowledge of the sources and biological functions of vitamin D, including its formation from UV irradiation, and its role in maintaining calcium levels, bone mineralization, and absorption of phosphate.
