Although all nephrons in the kidney have the same general disposition,
there are regional differences, particularly in the length of the loops of
Henle. Glomeruli that lie deep in the renal cortex near the medulla
(juxtamedullary glomeruli) possess long loops of Henle that pass deeply
into the medulla, whereas more superficial cortical glomeruli have much
shorter loops. Among different animal species the length of the loops
varies considerably and affects the ability of the species to concentrate
urine above the osmotic concentration of plasma.
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