19721 - Vitamin Deficiency Disorders Abdelaziz Elamin MD,...

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Vitamin Deficiency Disorders Vitamin Deficiency Disorders Abdelaziz Elamin Abdelaziz Elamin MD, PhD, FRCPCH MD, PhD, FRCPCH Professor of Child Health Professor of Child Health College of Medicine College of Medicine Sultan Qaboos University Sultan Qaboos University Muscat, Oman Muscat, Oman azizmin azizmin @hotmail.com @hotmail.com
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BACKGROUND BACKGROUND Vitamins are organic substances that are  essential for several enzymatic functions in  human metabolism thus the term vitamin was invented
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VITAMINS VITAMINS  Vitamins are classified according to  soluble .    13 vitamins are known, 4 fat soluble  .
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VITAMIN A VITAMIN A   Vitamin A is a generic term for many  related compounds.   Retinol (alcohol), Retinal (aldehyde) are  often called preformed vitamin A. Retinal  can be converted by the body to retinoic  acid which is known to affect gene  transcription.   Body can convert  β -carotene to retinol,  thus called provitamin A.
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FUNCTIONS FUNCTIONS Vision Vision : rodopsin necessary for dark adaptation.
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19721 - Vitamin Deficiency Disorders Abdelaziz Elamin MD,...

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