151.L1.Lect7.Kidney.11.22.13.Stu

Counter current flow in blood vessel descending loop

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Unformatted text preview: t absorption or re-absorption in this case. Counter-current flow in blood vessel Descending Loop of Henle: loses water (passive Descending transport), retains salt salt (units in mOsm/L) The greater the mOsm/L value, the more salt/urea concentrated the fluid: - in extracellular fluid when indicated outside nephron - in filtrate when indicated inside nephron Campbell Figures 44.15-16 Descending Loop of Henle: loses water (passive Descending transport), retains salt salt (units in mOsm/L) In epithelial cell membranes: - high density of aquaporin-1 (water transporter) - few Na+/K+ pumps - few Na+/Cl- cotransp. - only water moves out of filtrate as extracellular solute conc. rises towards Inner medulla - REDUCES VOLUME OF FILTRATE The greater the mOsm/L value, the more salt/urea concentrated the fluid: - in extracellular fluid when indicated outside nephron - in filtrate when indicated inside nephron Campbell Figures 44.15-16 Ascending Loop of Henle: retains water, loses salt Ascending [active transport, thickened walls of nephron] nephron] (units in mOsm/L) The greater the mOsm/L value, the more salt/urea concentrated the fluid: - in extracellular fluid when indicated outside nephron - in filtrate when indicated i...
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