Vitamin
A is the name of a collection of fat-soluble retinue, including
retinal, retinal, and retinal esters Vitamin A is involved in protected
function, vision, imitation, and cellular communication. Vitamin A is
grave for
vision as an indispensable component of Rhodesian, a protein that
absorbs light
in the retinal receptors, and because it supports the normal
differentiation
and execution of the conjunctiva membranes and cornea. Vitamin A also
chains
cell growth and differentiation, playing a critical role in the normal
pattern
and maintenance of the heart, lungs, kidneys, and other organs Two forms
of
vitamin A are to be had in the human diet: preformed vitamin A (retinal
and its testifier form, retinal ester) and pro vitamin A adenoids.
Preformed vitamin
A is found in foods from animal source, including dairy products, fish,
and
meat (especially liver). By far the most important pro vitamin A
carotene is
beta-carotene; other pro vitamin A carotids are alpha-carotene and
beta-cryptography. The body converts these plant pigments into vitamin
A. Both pro vitamin A and preformed vitamin A must be metabolized
extracellular to
retinal and cretin acid, the active forms of vitamin A, to support the
vitamin's important biological functions .Other adenoids set up in food,
such
as Penelope, lute in, and Xanthippe, are not transformed into vitamin A.
The a
range of forms of vitamin A are soliloquized into Michelle in the
intestinal lumpen and absorbed by duodenal mucous cells .Both retinal
esters and pro vitamin A adenoids are converted to retinal, which is
oxidized to retinal
and then to cretin acid .Most of the body's vitamin A is stored in the
liver
in the form of retinal esters.
