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| Occuring compunds with biological activity of retinal |
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| one of the carotenoids; an orange pigmetn and vitamin A precursor found in plants |
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| Chemically related compunds with biologicl activity similar to that of retinol |
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| pigments commonly found in plants & animals |
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| referring to both the active forms of vitamin A and the precursor forms in foods |
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| specific protein responsible for transporting retinol |
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| the transparent membrane covering the outside of the eye |
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| the layer of ligth-sensitive nerve cells lining the back of the inside of the eye |
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| molecule absorb wavelengths of ligth reflect on those perceive as certain colors |
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light sensitive pigment of the retina;
rhod=red (pigment)
opsin=visual protein |
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| the protein portion of the visual pigment molecule |
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| the process by which immature cells develop specific functions |
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| cells on the surface of teh skin and mucous memberane |
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| the layer of the body that serves as a selcective barrier between the body's and the environment |
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