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Vitamin A

Flashcards for vitamin A

TermDefinition
What are the two main categories of vitamin A compounds? Retinoids and carotenoids.
Which form of vitamin A is found in animal foods? Retinol.
Which form of vitamin A is part of the visual pigment rhodopsin? Retinal.
What is the active form of vitamin A involved in gene expression and cell differentiation? Retinoic acid.
Provitamin A compounds that are precursors to vitamin A? Carotenoids.
Which carotenoid acts as both an antioxidant and a precursor to vitamin A? Beta-carotene.
What are the main physiological functions of vitamin A? Vision, immunity, growth, development, maintenance of epithelial tissues, and red blood cell production.
Inadequate vitamin A intake leading to insufficient rhodopsin regeneration results in? Night blindness.
Severe eye dryness from vitamin A deficiency that can progress to blindness. Xerophthalmia.
Which type of vitamin A can be toxic, retinoids or carotenoids? Retinoids.
Which foods are rich in retinoids? Beef liver, cod liver oil, eggs, butter, and whole milk.
Which foods are rich in carotenoids? Carrots, pumpkin, butternut squash, mango, cantaloupe, kale, and dark green leafy vegetables.
How can plant carotenoid absorption be improved? By chopping and cooking vegetables in fat such as olive oil.
Health benefits associated with adequate vitamin A intake? Reduced risk of infections, autoimmune disease, kidney stones, some cancers, and improved sleep and vision.
Created by: tainner
 

 



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