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Old 28th September 2005, 09:39 PM   #1 (permalink)
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Unhappy anyone any good at physics? i am in the crap
background info- sodium is freely filtered from plasma into the first part of the human kidney tubule. the sodium concentration in the initial tubular fluid is therefore the same as plasma (140mM). A normal person filters fluid into the kidney at a rate of 0.125l/min. Sodium that enters the kidney tubule leaves by one of two routes: by reabsorption into the plasma or by excretion into the urine

the rate at which sodium enters the kidney tubule is calcualted using the following:

Na entry rate (mmol/min) = Na conc (mm/l) x filtration rate (1/min)

problem----

a person excretes 1.2ml/min urine with a Na concentration of 120 mM. Given normal plasma Na concentrationa dn kidney tubule filtration rate, calcualte the amount of Na that must be reabsorbed into the plasma per minute



PLEASE HELP
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Old 28th September 2005, 09:42 PM   #2 (permalink)
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Old 28th September 2005, 09:45 PM   #3 (permalink)
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This isn't physics, if anything it's chemistry.
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Old 28th September 2005, 09:47 PM   #4 (permalink)
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it is biology... in a wee mix.. please anyone?!
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Old 28th September 2005, 09:47 PM   #5 (permalink)
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i think freakonaleash has a degree in physics - she could help
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Old 28th September 2005, 09:51 PM   #6 (permalink)
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Na+ entry rate = Na+ concentration * filtration rate

You have to work out the urine filtration rate first, then get the total filtration. Then subtract the difference. Then.....

swap the equation round so you get: filtration rate = Na+ entry rate/ Na+ conc.

Then that's the answer


i think this is what i need to do.... but i cannot do it
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Old 28th September 2005, 09:52 PM   #7 (permalink)
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Quote:
Originally Posted by captainclegg
i think freakonaleash has a degree in physics - she could help
steve surely you remember what my degree is in, we have known each other for years! tsk men!!
um will have a look
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Old 28th September 2005, 09:57 PM   #8 (permalink)
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em why you got conc as mM first, but mm/l in equation?
and what does mmol stand for?
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Old 28th September 2005, 10:06 PM   #9 (permalink)
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Quote:
Originally Posted by freakonaleash
em why you got conc as mM first, but mm/l in equation?
and what does mmol stand for?
millimole I imagine. I can't remember what a mole is, but luckily, wikipaedia comes to the rescue

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.

2. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
Last edited by humndislocation : 28th September 2005 at 10:41 PM.
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Old 28th September 2005, 10:11 PM   #10 (permalink)
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wait wait wait let me get this right?!! u go to uni............ to learn about pissing?
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Old 28th September 2005, 10:42 PM   #11 (permalink)
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Quote:
Originally Posted by Thanatos
wait wait wait let me get this right?!! u go to uni............ to learn about pissing?
Why not? It prepares you for the working world, where you'll be pissed on, on a regular basis.
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Old 29th September 2005, 12:34 PM   #12 (permalink)
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so no-one?!
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Old 29th September 2005, 01:10 PM   #13 (permalink)
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im guessing it would help if you knew what subject you were working with...it looks like chemistry to me but then fuck studying that.
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Old 29th September 2005, 03:53 PM   #14 (permalink)
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