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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.
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
-lotionsThese 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/wchlanianie-witamina-a/
http://portal.abczdrowie.pl/naturalne-wystepowanie-witamin
http://www.biotechnologia.uni.opole.pl/biblioteka/docs/WITAMINY-PRAWDA-I-MITY.pdf
http://forumsportowe.us/viewtopic.php?t=179 http://www.nhs.uk/Conditions/vitamins-
minerals/Pages/Vitamin-A.aspx http://jejzdrowie.pl/dzialanie-witaminy-a Claude A.Villee- „Biologia” Phil Bradfield and Steve Potter -LONGMAN
GCSE Biology