Tubular reabsorption part 1


MEDICINE FOR ALL

Kidney tubule 1

Kidney tubule 2

Total plasma volume filters into the renal tubules about every 22 minutes, so all plasma  would be drained  away as urine in less than 30 minutes were it not for the fact that most of the tubule contents are quickly reclaimed  and returned to the blood. This reclamation process, called tubular reabsorption, is a selective transepithelial process that begins as soon as the filtrate enters the proximal tubules. To reach the blood, reabsorbed substances follow either  either the transcellular or paracellular route. In the transcelullar route, transported transported substances move through the luminal membrane, the cytosol, and the basolateral membrane of the tubule cell and then the endothelium of the peritubular capillaries.  Movement of substances in the paracellular route between the tubule cells is limited because these cells are connected by tight junctions. In the proximal nephrons, however, these tight junctions are “leaky” and allow some important ions (Ca

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Published by Vincent S Artale Jr

Biblical studies, Health and Nutrition, Biology, Fitness, Hiking, Reading. Re-blogging doesn't equal agreement.

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