Podcast
Questions and Answers
What is the primary pro vitamin D source in human and animal tissues?
What is the primary pro vitamin D source in human and animal tissues?
- Cholecalciferol
- 7-dehydrocholesterol (correct)
- Ergosterol
- Calcidiol
Which form of vitamin D is considered the active form?
Which form of vitamin D is considered the active form?
- Calcidiol
- Calcitriol (correct)
- Ergocalciferol
- 25-OH-D
Which of the following is a consequence of vitamin D deficiency in children?
Which of the following is a consequence of vitamin D deficiency in children?
- Bone deformities (Rickets) (correct)
- Hemolysis of red blood cells
- Renal stones
- Infertility
What is a symptom of vitamin E deficiency?
What is a symptom of vitamin E deficiency?
Excessive intake of vitamin D can lead to which of the following conditions?
Excessive intake of vitamin D can lead to which of the following conditions?
Flashcards
Vitamin D activation process
Vitamin D activation process
Ergosterol (plant) or 7-dehydrocholesterol (human/animal) is converted to vitamin D2(calciferol) by UV light. The liver converts calciferol to 25-hydroxyvitamin D, then the kidneys convert this to the active form, calcitriol.
Vitamin D function
Vitamin D function
Vitamin D regulates calcium and phosphate levels in the blood and promotes bone health by assisting in calcium and phosphate absorption.
Vitamin D deficiency symptoms
Vitamin D deficiency symptoms
Deficiency in children causes rickets (bone deformities), and in adults, osteomalacia (softened bones).
Vitamin E types
Vitamin E types
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Vitamin E function
Vitamin E function
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Study Notes
Vitamin D (Calciferol)
- Vitamin D is a steroid ring
- Ergosterol is the provitamin D in plants
- 7-dehydrocholesterol is the provitamin D in humans and animals
- Vitamin D has 2 forms: D2 and D3
- Vitamin D activation involves UV light, liver, and kidney
- Activated forms include calcifediol (25-OH-D) and calcitriol (1,25(OH)2D)
Vitamin D Function
- Normalizes serum calcium and phosphate levels
- Normalizes bone by providing calcium and phosphate
Vitamin D Deficiency
- Rickets in children (bone deformities)
- Osteomalacia in adults (softening of bones)
Vitamin D Excess (Hypervitaminosis)
- Abnormal calcification of tissue and deposition of calcium and phosphate in the kidney (renal stones)
Vitamin E (Tocopherols)
- Four types: α, β, γ, and δ
- α-tocopherol is the most active form
- Function:
- Anti-sterility
- Antioxidant
- Protects from atherosclerosis and heart disease (prevents LDL oxidation)
Vitamin E Deficiency
- RBC hemolysis (due to oxidation) in premature infants
- Infertility
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