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Urine hypertonic to the blood?

Discussion in 'MCAT Study Question Q&A' started by darkhope, Jun 24, 2011.

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  1. darkhope

    darkhope 10+ Year Member

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    Dec 29, 2006
    Hi guys, so i was looking at a study review, and it states that the primary function of the nephron is to create urine that is hypertonic to the blood? But I don't get that, because urine is supposedly so concentrated to limit water loss so how can urine be hypertonic to blood if its so concentrated...shouldn't it be hypotonic instead...i'm so confused...
     
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  3. loveoforganic

    loveoforganic -Account Deactivated- 2+ Year Member

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    Hypertonic means it has a bunch of crap in it. Your logic is right, you're just mixing up your terms
     
  4. MShopes

    MShopes 5+ Year Member

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    Jun 16, 2011
    Simply put, hypertonic means it has higher solute amount. When it says so concentrated means it has higher solute concentration than the blood and thus it is hypertonic to the blood since the blood has lower solute content and higher solution.
     
  5. darkhope

    darkhope 10+ Year Member

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    Dec 29, 2006
    thanks alot guys!
     
  6. salim271

    salim271 Patience is tough. :/ 2+ Year Member

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    May 21, 2011
    Michigan
    Water loss can be limited by hormones such as aldosterone and ADH. The membranes in the nephrons can be manipulated to lose solutes, water, or both. Whether the urine is hyper or hypo to its environment doesnt matter if there is an impermeable membrane between them.
     
  7. CodeBlu

    CodeBlu Van Wilder Lifetime Donor 5+ Year Member

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    Oct 13, 2010
    Sunset Blvd.
    The best way to think of it...

    The way the kidney is set up... specifically the transporters in the nephron allow for concentration of the urine. Plus the gradients help too. Here's a good animation.

    http://www.cellphys.ubc.ca/undergrad_files/urine.swf
     

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