«Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids (most notably beta-carotene). Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision. Vitamin A also functions in a very different role as retinoic acid (an irreversibly oxidized form of retinol), which is an important hormone-like growth factor for epithelial and other cell.
In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to retinol (chemically an alcohol) in the small intestine. The retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal.
All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group. Both structural features are essential for vitamin activity. The orange pigment of carrot (beta-carotene) can be represented as two connected retinyl groups, which are used in the body to contribute to vitamin A levels. Alpha-carotene and gamma-carotene also have a single retinyl group, which give them some vitamin activity. None of the other carotenes have vitamin activity. The carotenoid beta-cryptoxanthin possesses an ionone group and has vitamin activity in humans.
Vitamin A can be found in two principal forms in foods:» (wikipedia)
Do something with Vitamin A, already
This screen hints what BioMindmap can do with medical objects
- See 14 Biolinks that connect Vitamin A with other objects
- Group Biolinks by type — promoters and inhibitors separately
- Summarize how other objects relate to Vitamin A
- There are 10 Evidences supporting 14 Vitamin A Biolinks
Guide for Good Sources list of respected domains.
The ValidityScore showsthe quality of evidences, with max 9.9.
- Vitamin A Mindmap — near connections
- Mindmap with ValidityScore 5.0 — near connections
- Mindmap of Vitamin A. and Subnodes: .
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- Instream into nodes that connect into Vitamin A.
- Outstream from nodes that go out from Vitamin A.
- Promoters of Vitamin A
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