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28 Cards in this Set
- Front
- Back
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What form does our body recognize P as?
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phosphate ( H2PO3)
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What role does phosphate ion have in our body?
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buffer
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What are sources of P?
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meat, poultry, diary, eggs, fish
* comes with protein |
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What is phytic acid?
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indigestible component of grains that can bind to calcium and drag it out so it doesn't get absorbed
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What are all the minerals that phytic acid has a negative effect on?
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* Ca, *Zn, mg and iron
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What enzyme neutralizes phytic acid so it doesnt hurt the intestines? What contains this enzyme?
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phytase, yeast
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How is phosphorous digested in the small intestine?
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gets hydrolyzed to inorganic phosphate
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What ways does P get transported into the enterocyte?
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carrier-mediated transport and facilitative diffusion
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What increases the absorption of P?
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Calcitriol
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what decreases the absorption of P?
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Al(OH)3, antacids and divalent cations
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what is the absorption efficiency?
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about 60%
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where is most P found in the body?
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bone and muscle cells
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about how much P is found in bone?
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80%
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About how much P is found in the body
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600-800 g
* about 1.5 pounds |
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What structures does P have functions in nucleotide/ nucleoside phosphates?
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RNA and DNA
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How does P have a function in energy storage and transfer
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in ATP and creatine phospate
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What is P's role in DNA and RNA?
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its the zipper that holds DNA and RNA together
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Calcitriol stimulates the intestinal absorption of which minerals?
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Ca and PO4
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In the kidney, what affect does PTH have?
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causes increased Ca and decreased PO4 resorption
*PTH tells kidney to throw out P and keep Ca |
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What does PTH pair with to resorb calcium in kidneys?
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PTh
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What is Vit D's role in resorption?
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goes to the intestine and initiates resorption of BOTH Ca and P
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Where is calcium only resorbed and where is both calcium and P resorbed?
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kidney - only Ca
intestine - both Ca and P |
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How is P mainly excreted>
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via the urine - about 67-90%
* P excretion is PROPORTIONAL to intake |
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What is the RDA and usual intake for P?
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RDA = 700 mg
usual intake about 1400 mg |
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What population is a P deficiency usually seen>
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renal patients
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What population may have a problem with toxicity?
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Renal patients
*high levels causes bone loss |
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how is P assessed?
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serum concentrations
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Toxicity AND deficiency is seen in what type of patients? Why?
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renal patients, because of the malfunctioning of the kidneys
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