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  • Title: The renal pelvis: machinery that concentrates urine in the papilla.
    Author: Dwyer TM, Schmidt-Nielsen B.
    Journal: News Physiol Sci; 2003 Feb; 18():1-6. PubMed ID: 12531923.
    Abstract:
    Two decades ago, Bodil Schmidt-Nielsen and Bruce Graves documented the rhythmic contractions of the renal pelvis in a remarkable video, visually demonstrating how peristaltic waves empty the papilla and how the subsequent elastic recoil draws water from the collecting duct and into the tethered-open ascending vasa recta. Thus a periodic hydrostatic gradient generates an axial osmotic gradient. This review recapitulates the video and offers a link to figures and scenes digitized from the original tape.
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