Question
Discuss the metabolism of vitamin A and name two dietary sources.
Answer :
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Vitamin A metabolism begins with dietary intake either as preformed vitamin A (retinol and retinyl esters) from animal foods or as provitamin A carotenoids from plant sources. In the small intestine, retinyl esters are hydrolyzed to retinol, while carotenoids such as beta-carotene are cleaved by beta-carotene dioxygenase to form retinal. Retinal is then reduced to retinol within enterocytes and re-esterified before being incorporated into chylomicrons for transport through the lymphatic system to the liver. The liver serves as the
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