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    What is the loop of henleall this kidney stuff is driving me crazy
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    The loop bit....
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    What about it??
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    Na+ and Cl- ions pumped out ascending limb

    medulla more conc

    water drawn out of descending limb and collecting duct by osmosis

    this counter-current multiplier system is just another method of getting water out of the tubules of the kidney... that's all
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    the longer it is, the more reabsorption occurs, which is good for desert animals,

    if they reabiosrb more, then they can go without water for a longer time
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    why dont we just store all hte water for when we need it?
    and what heppens in druaght? does urea pass out as a solid lol
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    the loops of henle of each nephron are in the medulla of the kidney therefore the tissue fluid in the medulla have a high solute concentration. Therefore when urine pases throught the last stage of the nephron, into the collecting duct and therefore back into the medulla (providing that ADH is present), water diffuses down concentration gradient by osmosis and into the tissue fluid, making urine more concentrated and reducing the volume of urine excreted out
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    (Original post by carcharodon)
    why dont we just store all hte water for when we need it?
    and what heppens in druaght? does urea pass out as a solid lol

    heehee

    animal cells dont have cell walls ----->would burst

    too much water would dilute cell contents by too much
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    Basicllywhat Happends The Loops Are Counter Current Multiplers, Since They Run Parallel To Each Other But Work In Oppoiste Direction . Na And Cl Is Pumped From The Acending Lim, Making The Surrounding Tissue Fluid Have A Negative Pater Potential The Water Is Then Lost Passively From The Decending Limp. The Fluid Becomes Most Concentrated, At The Bottom Of The Loop. The Presence Of Adh , Influences The Amount Of Water That Is Taken Up In The Collecting Duck. Enjoy.
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    wow you lot are so knowledgeable
    is urine hypotonic to the tissue fluid??
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    remind me what hypotonic means

    (the opposite is isotonic yea??)
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    erm isotonic is equal water potential
    inm not sure what hypo means lol
    i just read it somewhere
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    one sec ill look it up in my AS book!!....................
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    hypertonic - extracellur fluid higher solute concentration therefore lower water potential -------> water diffuses out of the cell = flaccid

    Hypotonic - extracellular fluid has lower solute concentration, higher water potention -------> water diffuses into the cell = bursts



    so yea that statment you made was right!!
 
 
 
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