Podcast
Questions and Answers
Which type of vitamins are readily excreted in the urine and toxicity is rare?
Which type of vitamins are readily excreted in the urine and toxicity is rare?
Which of the following is NOT a fatsoluble retinoid?
Which of the following is NOT a fatsoluble retinoid?
Where are significant quantities of fat soluble vitamins stored in the body?
Where are significant quantities of fat soluble vitamins stored in the body?
What are the main functions of fatsoluble retinoids?
What are the main functions of fatsoluble retinoids?
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What is the role of retinoic acid in the body?
What is the role of retinoic acid in the body?
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Which form of vitamin A predominates in nature?
Which form of vitamin A predominates in nature?
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Where are retinol and carotenes absorbed in the body?
Where are retinol and carotenes absorbed in the body?
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What is the daily requirement of vitamin A for adult males and females?
What is the daily requirement of vitamin A for adult males and females?
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Which source provides three preformed compounds of vitamin A?
Which source provides three preformed compounds of vitamin A?
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Which organ stores retinol when absorbed in the body?
Which organ stores retinol when absorbed in the body?
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What do rod cells in the retina process?
What do rod cells in the retina process?
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What is the primary function of the optic nerve?
What is the primary function of the optic nerve?
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Which type of cells in the retina are specialized for color and detail vision in bright light?
Which type of cells in the retina are specialized for color and detail vision in bright light?
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What is the RDA for adult males and females for vitamin A?
What is the RDA for adult males and females for vitamin A?
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Which compound does not serve as a precursor of vitamin A2?
Which compound does not serve as a precursor of vitamin A2?
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What is contained in fresh water fish that distinguishes it from other animal sources?
What is contained in fresh water fish that distinguishes it from other animal sources?
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Study Notes
Vitamins and Toxicity
- Water-soluble vitamins are readily excreted in the urine, and toxicity is rare.
Fatsoluble Vitamins
- Fat-soluble vitamins are stored in significant quantities in the body's adipose tissue.
Fatsoluble Retinoids
- The main functions of fatsoluble retinoids include regulating genes, differentiating cells, and maintaining epithelial tissues.
- Retinoic acid plays a crucial role in the body by regulating gene expression and promoting cell differentiation.
Vitamin A
- Vitamin A predominates in nature in its beta-carotene form.
- Retinol and carotenes are absorbed in the small intestine.
- The daily requirement of vitamin A for adult males is 900 μg/day and for adult females is 700 μg/day.
- Liver and dairy products are sources that provide three preformed compounds of vitamin A.
- The liver stores retinol when absorbed in the body.
Retina and Vision
- Rod cells in the retina process dim light and peripheral vision.
- The primary function of the optic nerve is to transmit visual information from the eye to the brain.
- Cone cells in the retina are specialized for color and detail vision in bright light.
Vitamin A Requirements
- The Recommended Dietary Allowance (RDA) for adult males is 900 μg/day and for adult females is 700 μg/day.
Vitamin A Precursors
- Lycopene does not serve as a precursor of vitamin A2.
Freshwater Fish
- Freshwater fish are distinguished from other animal sources by containing astaxanthin, a carotenoid pigment.
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Description
This quiz covers an overview of vitamins, focusing on the definition and classification of vitamins. It includes information about water-soluble vitamins, their excretion, and rare toxicity, as well as fat-soluble vitamins, their absorption, and transportation.
