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Vitamin a
 

Vitamin a

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Vitamin a Vitamin a Presentation Transcript

  • EJEH LOVETH JENYWUOJO PREMD2 1805 VITAMIN A
  • WHAT TO EXPECT.....  Introduction  other names  types  structure  sources  funtions  hypervitaminosis  deficiencies  references  closing prayers
  • VITAMIN A A yellow, fat-soluble, solid terpene alcohol, obtained from carotene and occurring in green and yellow vegetables, egg yolk, etc.: essential to growth, the protection of epithelial tissue, and the prevention of night blindness.
  • OTHER NAMES OF VITAMIN A  3-Dehydroretinol,  Acétate de Rétinol,  Antixerophthalmic Vitamin,  Axerophtholum,  Dehydroretinol,  Oleovitamin A,  Palmitate de Rétinol, Retinoids,  Retinyl Palmitate,  Vitamin A Acetate, Vitamin A Palmitate, Vitamin A1,  Vitamin A2,  Vitamine Liposoluble,  Vitaminum A.  Rétinoïdes,  Rétinol,  Retinol Acetate,
  • TYPES OF VITAMIN A There are basically two types of vitamin A -Vitamin A1:- A yellow crystalline compound, C20H30O, extracted from egg yolks, milk, and cod-liver oil. -Vitamin A2:- A golden yellow oil, C20H28O, occurring chiefly in the livers of freshwater fish and having about 40 percent of the biological activity of vitamin A1
  • Vitamin A constitute both retinol , which is a pre-formed vitamin and beta – carotine which is a pro- vitamin which is converted into retinol in intestinal mucosa. The international unit is used for the measurement , IU. 1IU= 0.3MICROGRAMS OF RETINOL.
  • SOURCES OF VITAMIN A IN ANIMALS.... -liver -cheese -milk -meat -egg -butter -fish IN PLANTS -mango -papaya -carrot -spinach -pumpkin -amarath
  • FUNCTIONS Vision Gene transcription Immune function Embroyonic development and reproduction Bone metabolism Haematopoieses Skin health Antioxidant activity
  • HYPERVITAMINOSIS A ACUTE:- caused by taking too much vitamin A over a short period of time CHRONIC:- occurs when too much of the vitamin A is present over a longer period
  • SYMPTOMS  Abnormal softening of the skull bone (craniotabes -- infants and children)  Bone pain or swelling  Bulging fontanelle (infants)  Changes in consciousness  Decreased appetite  Dizziness  Drowsiness  Headache  Increased intracranial pressure  Irritability  Liver damage  Nausea  Poor weight gain  Skin and hair changes  Cracking at corners of the mouth  Higher sensitivity to sunlight  Vision changes
  • TESTS AND EXAMS Bone x-rays Blood calcium test Cholesterol test Liver function test Blood test to check vitamin A levels
  • DEFICIENCY OF VITAMIN A rickets blindness xeropthalmia keratomalacia bitot's spot follicullar hyperkeratosis xerosis conjunctiva xerosis cornea
  • XEROPTHALMIA  dryness of tear glands  symptoms include night blindness and eye irritation
  • KERATOMALACIA drying and clouding of the cornea
  • BITOT'S SPOT buildup of keratin debris on the conjunctiva
  • REFERENCES  'Discovery' of Vitamin A.". Annals of Nutrition and Metabolism 61 (3): 192–198. doi:10.1159/000343124.  http://en.wikipedia.org/wiki/Vitamin_A  http://www.news-medical.net/health/Vitamin-AFunctions.aspx  http://www.nlm.nih.gov/medlineplus/ency/article/ 002400.htm  http://www.vivo.colostate.edu/hbooks/pathphys/ misc_topics/vitamina.html  http://www.ext.colostate.edu/pubs/foodnut/0931 5.html