• Like
Vitamin a
Upcoming SlideShare
Loading in...5
×
Uploaded on

 

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
762
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
57
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide
  • {}

Transcript

  • 1. EJEH LOVETH JENYWUOJO PREMD2 1805 VITAMIN A
  • 2. WHAT TO EXPECT.....  Introduction  other names  types  structure  sources  funtions  hypervitaminosis  deficiencies  references  closing prayers
  • 3. 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.
  • 4. 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,
  • 5. 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
  • 6. 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.
  • 7. SOURCES OF VITAMIN A IN ANIMALS.... -liver -cheese -milk -meat -egg -butter -fish IN PLANTS -mango -papaya -carrot -spinach -pumpkin -amarath
  • 8. FUNCTIONS Vision Gene transcription Immune function Embroyonic development and reproduction Bone metabolism Haematopoieses Skin health Antioxidant activity
  • 9. 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
  • 10. 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
  • 11. TESTS AND EXAMS Bone x-rays Blood calcium test Cholesterol test Liver function test Blood test to check vitamin A levels
  • 12. DEFICIENCY OF VITAMIN A rickets blindness xeropthalmia keratomalacia bitot's spot follicullar hyperkeratosis xerosis conjunctiva xerosis cornea
  • 13. XEROPTHALMIA  dryness of tear glands  symptoms include night blindness and eye irritation
  • 14. KERATOMALACIA drying and clouding of the cornea
  • 15. BITOT'S SPOT buildup of keratin debris on the conjunctiva
  • 16. 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