FINAL: phosphorous Flashcards
is there phosphorous in our cells?
NO
food sources of phosphate
animal proteins
cereals
legumes
2 most abundant body minerals
- calcium
- phosphate
85% of phosphate is found in __ as __
85% of phosphate is found in bone as calcium phosphate aka hydroxyapatite (crystal bone)
15% of phosphate is found in __ as (4)
15% of phosphate is found in skeleton as:
phosphoproteins
phospholipids
nucleotides
nucleic acids
0.1% of phosphate is found in __ which is important for __
0.1% of phosphate is found in extracellular fluid which is important for pH
__% of phosphate from protein is absorbed
70-90% of phosphate from protein is absorbed
phosphate in grain is __
phosphate in grain is phytate/phytic acid
__% of phosphate in grain is NOT absorbable
__% in potatoes/tubers
80% of phosphate in grain is NOT absorbable
35% in potatoes/tubers
problem with phytic acid
phytic acid is negative and traps cations (Ca, Zn, Fe, Cu)
excess phytic acid + __ = deficiency
excess phytic acid + poor phosphate intake = deficiency
RDA for phosphate increases in __
RDA does not increase in __
RDA for phosphate increases in childhood
RDA does not increase in adulthood
why is RDA higher for children?
they are growing their skeletons
is phosphorous a nutrient of concern?
No
does phosphorous have an upper limit? if so, why?
Yes, because if kidneys don’t work well, phosphate filtration won’t work well
intestinal absorption of phosphate occurs via __
intestinal absorption of phosphate occurs via Npt2
what type of transporter is Npt2?
facilitated co-transporter (symporter)
Npt2 is __ depdent and is found on __ side of intestine
Npt2 is sodium depdent and is found on apical side of intestine
Npt2 is upregulated by
vitamin D
lage amount of __, __, and __ (__) can decrease phosphorous absorption
lage amount of Ca, Mg, and Al (antacids) can decrease phosphorous absorption