antioxidant Flashcards
how does antioxidant neutralize cell damage from free radical ?
stable in both oxidized and reduced form, donate an elec
epithelial cells vs epithelial tissue
cells on skin surface and mucus membrane vs layer between body’s interior and environment
____ and ____, both _____, concert into retinol
alpha carotene: beta cryptoxanthin / pro-vit A precursor
roles of vit A
antioxidant / promote cision / for protein sunthesi and cell differentiation/ reproduction and growth
vit A precursor found in plant
carotenoid
90% of vut A stores in _____
liver
role of vit A for men / women / children
sperm dvlopment / fetal dvlopment / slow growth for bone remodeling
why cant u see quickly at night after bright flashes of light ?
experience night blind ess bcs of vit A deficiency. not enough retinol to retina ‘ eye cant regenerate visual pigments bleached by light
explain xerophthalmia/ xerosis / keratomalacia
= total blindness
dry cornea due to inadeuqre mucus production
softening cornea
acute symptoms of Vit a toxicity
nausea blurred vision vomitting and vertigo
deficiency of vit E
Rbc breaks open from oxidized polyunsat fat
Erythocyte hymolysos and hemolytic anemia
Neuronuscular dysfunction in spinal cord and retina
purpose of alpha tocopherol
stop chain rxn of free radical; prevent oxidation of unsat fat
may reduce heart disease risk by prevent LDL against oxidation
vit C and Fe relation ?
vit C prevent Fe oxidation -> allow for iron absorption
food sources of vit A E C selenium
A: retinoids, carotenoids and dark leafy green
E: veggie oil nuts and seeds
C fruits and veggie
selenium: meat mill egg whole grain and brazil nut
what is Keshan disease?
heart enlargement disease: fivrous tissue to nerve tissue
