Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Vitamin A is a isoprenoid alcohol. It functions as hormone a visual pigment in our eyes. It has many functions in growth, reproduction, epithelial cells and vision. Vitamin A is obtained from the diet either as vitamin A or provitamin A ingested as carotenoids or retinyl esters which is metabolized to active compounds such as 11-cis retinal which is important for vision and all-trans-retinoic acids which is required for the biological actions of Vitamin A.
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