unit 4 fat soluble vit

Unit 4 fat soluble - Fat-Soluble Vitamins CHAPTER 9 Preformed vitamin A liver fortified milk fish liver oils Provitamin A red orange dark green and

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Fat-Soluble Fat-Soluble Vitamins Vitamins CHAPTER 9
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Preformed vitamin A : liver, fortified milk, fish liver oils Provitamin A : red, orange, dark green, and yellow veggies; orange fruits
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Vitamin A Retinoids: Collective term for the biologically active forms of vitamin A. Carotenoids Pigment materials in fruits and vegetables that range in color from yellow to orange to red
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Functions of Vitamin A Vision (especially night vision) Healthy epithelial tissue and cell differentiation Supporting reproduction and growth.
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Preformed vitamin A : liver, fortified milk, fish liver oils Provitamin A : red, orange, dark green, and yellow veggies; orange fruits
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Vitamin A (Retinal) and Vision Retina -Light perception Cornea – healthy, crystal clear Light falls on the eye, passes through the clear cornea strikes the cells of the retina, breaks down rhodopsin, initiating the signal that conveys the sensation of sight to the optic nerve in the brain.
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Night blindness Some vitamin A is lost in the bleaching and the regeneration of rhodopsin. The loss of vitamin A must be replaced from the blood supply If the vitamin A is too low, a lag occurs before the eye can see again after a flash of bright light at night. The lag in the recovery of night vision (night blindness) may indicate a vitamin A deficiency There is also often an inability to see in a dark room
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Preformed vitamin A : liver, fortified milk, fish liver oils Provitamin A : red, orange, dark green, and yellow veggies; orange fruits
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Vitamin A (retinoic Acid) & Epithelial Cells Epithelial tissue – The layer of the body that serves as a selective barrier between the body’s interior and the environment (cornea of eyes, the skin, respiratory lining, lining of the digestive track and many other systems). Retinoic acid is necessary for the production, structure, and normal function of epithelial cells
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Vitamin A (retinoic Acid) & Cell Differentiation Process of transforming an unspecialized cell into a specialized one; allowing a cell to mature so that it is capable of performing a particular function. Example: Mature goblet cells (type of epithelial cell) specialize in synthesizing and releasing mucus. If vitamin A is deficient, Goblet cells, among others, fail to mature, then fail to make mucus and eventually die. Consequence – cells that secrete keratin displace some of the dead goblet cells, making the surfaces, dry, hard, cracked and vulnerable to infection.
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Xerophthalmia: corneal xerosis (dry & hard) then keratomalacia (softening of cornea) Healthy Eye Vitamin A deficiency – north Americans are at little risk of developing a vitamin A deficiency
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Vitamin A (Retinol ) and Reproduction and Skeletal Development Men: Sperm development; women: normal fetal development; Children grow taller by remodeling old bone into a new bigger version; In remodeling old bone structures are dismantled and
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This note was uploaded on 06/15/2008 for the course HUN 1201 taught by Professor Razsaadat during the Fall '08 term at FSU.

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Unit 4 fat soluble - Fat-Soluble Vitamins CHAPTER 9 Preformed vitamin A liver fortified milk fish liver oils Provitamin A red orange dark green and

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