Exam - Zinc Flashcards
supplement label
helps maintain immune function
where is zinc found in the body
in all organs, tissues, and bodily fluids (Zn2+)
what is the best food source for zinc
oysters
what are additional food sources for zinc
redmeat/chicken
beans
buts
crab
lobster
fortified cereal
dairy
3 main functions of zinc
- zinc-containing metalloenzymes
- oxidant defense
- DNA binding
how many zinc-containing metalloenzymes are known
More than 200
what are zinc-containing metalloenzymes involved in
all metabolic pathways
what do zinc-containing metalloenzymes provide
structural integrity by stabilizing tertiary protein structure
what do zinc-containing metalloenzymes play a role at
the reaction site of an enzyme
what must occur to zinc before absorption
must be released from amino acids by HCl and other digestive enzymes
2 ways that zinc can be absorbed
carrier-mediated (ZIP4) - primary
simple diffusion
why is male RDA higher
to support testosterone function
why is pregnant women’s RDA highest
to support fetal development
is zinc deficiency common in humans
yes - older adults, children and vegetarians
what can poor zinc absorption be caused by
phytic acid in grains
what can zinc deficiency do in children
slow growth (inadequate cell division), poor wounds healing, delayed sexual maturation, impaired taste
what can zinc toxicity lead to
neurological problems, numbness, metallic taste, nausea - causes copper deficiency due to activation of metallothionein
