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Tubular Reabsorption, Sodium and Water Reabsorption

Tubular Reabsorption, Sodium and Water Reabsorption. Tubular Reabsorption. Tubular reabsorption is when filtered substances are returned to the blood stream, causing change in the fluid composition. This takes place in the proximal convoluted portion

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Tubular Reabsorption, Sodium and Water Reabsorption

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  1. Tubular Reabsorption, Sodium and Water Reabsorption

  2. Tubular Reabsorption • Tubular reabsorption is when filtered substances are returned to the blood stream, causing change in the fluid composition. • This takes place in the proximal convoluted portion • The epithelial cells have a lot of microvilli that increases the surfaces area exposed to glomerular filtrate and enhance reabsorption. • It also returns substances to the internal environment • During this process substances crosses the cell membrane facing the inside of the tubule and then crosses the cell membrane facing the interstitial fluid.

  3. Tubular Reabsorption • The substances are transported out of the tubule fluid through the epithelium of the renal tubule, and into the interstitial fluid. They then diffuse into the peritubular capillaries. • Peritubular capillaries walls has more pores than other capillaries. • Plasma concentration here is high, adding to the enhancement of fluid absorption. • The substances moving down a concentration gradient must be lipid-soluble. • Active transport may move substances uphill against the concentrations gradient.

  4. Sodium and Water Reabsorption • Water reabsorption occurs by osmosis in the proximal convoluted tubule, it is closely associated with the reabsorption of sodium ions. • As water is reabsorbed from the filtrate, the substances that are still in the renal tubule become more concentrated. • After active transport moves positively charged ions through the tubular wall, negative charged ions accompany it through a form of passive transport. • The concentration of solutes to rise within the peritubular blood. • Water moves from the renal tubule into the peritubular capillary, this reduces the fluid volume in the renal tubule.

  5. Sodium and Water Reabsorption • Active transport of sodium ions continues as the tubular fluid moves though the nephron loop, the distal convoluted tubule, and the collection duct. • Water is absorbed in various segments of the renal tubule, most of the water and sodium ions that entered the renal tubule, are reabsorbed before urine is excreted.

  6. Questions • How does water reabsorption occur? • Where does tubular reabsorption take place? • What enhances fluid reabsorption? • What increases the surface area of the tubular reabsorption? • What does tubular fluid moves though?

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