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25 Cards in this Set
- Front
- Back
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What do fat-soluble vitamins require for their digestion and absorption?
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bile
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Three different forms of Vitamin A active in the body
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retinal, retinol, and retinoic acid
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Precursor for Vitamin A
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beta-carotene
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The carotenoid with the greatest Vitamin A activity is:
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beta-carotene
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Which is more efficient for absorption and conversion: Beta-carotene or retinoids?
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retinoids
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Is the conversion of retinol to retinal reversible or not?
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yes!!! reversible
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Conversion of retinal to retinoic acid is: reversible or not?
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no!; irreversible!
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What does retinol do?
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supports reproduction; major transport and storage form of Vitamin A
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What does retinal do?
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active in vision; an intermediate in the conversion of retinol to retinoic acid.
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What does retinoic acid do?
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acts like a hormone; regulates cell differentiation, growth, and embryonic development
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What specific 2 things does Vitamin A do for vision?
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helps maintain a crystal-clear outer window (cornea); participates in the conversion of light energy into nerve impulses at the retina.
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Vitamin A helps to protect against skin damage from ______.
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sunlight!
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In men, what part of Vitamin A participates in sperm development?
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retinol
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Vitamin A supports what for women?
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supports normal fetal development during pregnancy
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90% of the body's vitamin A stores are in the _________.
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liver
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Severe Vitamin A deficiency is the major cause of childhood __________ in the world.
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blindness
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Vitamin A is lost when milk is skimmed.
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true!!!!!!
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Riches sources of retinoids
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foods derived from animals
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Most foods with Vitamin A activity are usually what color(s)?
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green, yellow, orange, red
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Other name for Vitamin D
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calciferol
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a vitamin D deficiency creates a _________ deficiency.
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calcium
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The best natural sources of vitamin D are:
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oily fish
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Vitamin D sends signals to which 3 primary target sites?
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GI tract (absorb more calcium and phosphorus);
bones (release more); kidneys (retain more) |
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The current RDA for vitamin E is based on what form only?
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alpha-tocopherol
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Vitamin ____ deficiency and ____ deficiency often occur together.
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A; Iron
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