Leys- vitamins Flashcards
Measurements of vitamin levels in the blood relate more to ________ than to overall body status.
recent intake
what act as coenzymes in many metabolic pathways
Water-soluble vitamins
The body has no storage capacity for water-soluble vitamins except
B12
Evidence is emerging that suggests an excess of some B vitamins can be _______
toxic
Most vitamins are modified before they become active
yea…
B Vitamins are co-enzymes in different types of reactions:
B1 – carboxylations B2/B3 – oxidoreductases B6 – transaminases Biotin – carboxylases Folic acid/B12 – single carbon transfers
Lack of riboflavin causes
angular stomatitis
is needed, indirectly, for DNA synthesis
Folic acid
Inhibitors of ________ are used as antibiotics (trimethoprim) and cancer therapy (methotrexate).
folate reduction
There is an increased demand for_____ during pregnancy
folic acid
______ deficiency is one of the most common vitamin deficiencies
Folic acid
_____ is concentrated in the liver
B12
______ deficiency causes scurvy resulting in defective collagen synthesis
Vitamin C
Lack of _____ also impairs immune function
vitamin C
which type of vitamins can be more readily absorbed
water-soluble vitamins
which kind of vitamin can be stored in tissue?
fat-soluble vitamins
which fat-soluble vitamins can be toxic in excess
A and D
which vitamin is teratogenic and should be avoided during pregnancy
vitamin A
_______ is a signaling molecule that interacts with ligand-activated transcription factors
Retinoic acid
Deficiency of _______ causes night blindness
vitamin A
regulates calcium and phosphorous homeostasis
vitamin D
The majority of vitamin D is produced by
UV exposure of skin
Deficiency of vitamin D causes
demineralization of bones with increased susceptibility to fractures
is link to early childhood caries
Vitamin D deficiency
Vitamin K is necessary for
blood coagulation
