Transcript vitamin A
Vitamin A is known as retinol and occurs
only in animal products.
Plants have a yellowish dye known as
beta-Carotene (provitamin) which in
animal cells can be easily split into two
molecules of vitamin A.
RETINOL
C20H29OH
BETA-CAROTENE
C40H56
soluble in fat
relatively stable
sensitive to the light
sensitive to oxygen (administered with
vitamin E which is antioxidant)
play an important role in vision, bone
growth, reproduction, cell differentiation
and cell division.
helps regulate the immune system which
helps prevent or fight off infections by
making white blood cells that destroy
harmful bacteria and viruses.
help lymphocytes fight infections more
effectively.
Better absorption of
vitamin A will give us:
-the presence of fat
-vitamin D
-complex vitamins of
the B group
-vitamin C
-vitamin E
-calcium
-zinc
-phosphorus
Worse absorption of
vitamin A:
-sodium benzoate,
-vitamin D deficiency,
-caffeine,
-nicotine,
-alcohol,
-nitrites,
-steroids
-laxatives,
-damaged
pancreas.
Medicine
In the treatment of:
-acne
-Stretch marks
-dyskeratosis
-psoriasis
-photoaging of the skin
-lack of vitamin A
In cosmetiscs
-creams
-lotions
These cosmetiscs are very helpful for people with
skin problems.
egg
butter
cod-liver oil
cheese
whole milk
fish
meat
spinach
grapes
carrote
yellow pumpkin
tomatos
avocado
liver abnormality (symptoms of
poisoning)
central nervous system disorders
birth defects
reduced bone mineral density
that may result in osteoporosis
skin changes
respiratory infections
anemia and apathy
increased intracranial pressure
night blindness
damaged cornea of eye
inhibition of growth
http://www.witaminaa.com.pl/wchlanianiewitamina-a/
http://portal.abczdrowie.pl/naturalnewystepowanie-witamin
http://www.biotechnologia.uni.opole.pl/bibliote
ka/docs/WITAMINY-PRAWDA-I-MITY.pdf
http://forumsportowe.us/viewtopic.php?t=179
http://www.nhs.uk/Conditions/vitaminsminerals/Pages/Vitamin-A.aspx
http://jejzdrowie.pl/dzialanie-witaminy-a
Claude A.Villee- „Biologia”
Phil Bradfield and Steve Potter -LONGMAN
GCSE Biology
Weronika Kielar
Karolina Grzeszek
Magdalena Adamowicz
Karolina Kurys
THANK YOU FOR YOUR ATTENTION