Word Count : 240

---

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 _________ ___ _____ ____ __________ _________ ___ ______ __________ __________ _________ ________.
______ __________ ________ ____ _______ ______ ________ _________ ________.
______ ________ _______ __________ ____ _______.
____ ______ __________ _______ _________ ______ _______ __________.
________ ____ ________ _________ ______.
___ ______ _____ _________ ______ ___ _______ _______ _______ __________ __________ _______.
_____ __________ ______ ___ ___ ______ _________ ________ __________.
_________ ______ ______ ___ _______.
________ _____ ___ _________ ________ ________ __________ ____ ____ __________ ______.
______ ___ _________ __________ __________ ____ ______.
_________ _______ ____ __________ _____ _____ ___ ______ __________ ____ _________.
______ ________ ____ ___ _____ _______ _______.
____ ______ ____ _____ ____.
_________ ________ ________ ________ _____.
______ ________ ___ ____ ________ ___ _____ ______ ____ ______ __________.
________ ___ _____ ____ ___ ________ ______ __________ _____ _________.
___ __________ _________ ___ ________ ________ _________ ______ __________ _________.
_________ ________ _________ _______ __________ _____ __________ __________.
__________ _______ ______ _______ ________ ______ ___.
________ _______ _______ _____ _______ _____ ____ ____ ________ _____ ____.
__________ ___ ___ _______ _________ ______ __________ _________.
___ ___ ____.
Get Full Answer on WhatsApp