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6 Cards in this Set
- Front
- Back
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In what form does Vitamin A enter the body |
Retinyl Ester |
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Where do different types of vitamin A come from? |
Pro-vitamin carotenoids from fruit and veg Vitamin A from animal tissue A |
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How is Vitamin A broken down |
Pepsin releases it in the stomach and proteolytic enzymes in the small intestine. In the stomach, free carotenoids/retinyl esters congregate and clump together into fatty globules which proceed to duodenum |
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How much Vitamin A is absorbed from retinol |
80-90% |
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How much carotenoid is absorbed from fruit and veg |
50-60% depending on bioavailability but is increased at high doses |
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What happens in the small intestine |
Globules are broken down further into lipid molecules by bile salts. |
