Reabsorption

Reabsorption

In physiology, reabsorption or tubular reabsorption is the flow of glomerular filtrate from the proximal tubule of the nephron into the peritubular capillaries. This happens as a result of sodium transport from the lumen into the blood by the Na+/K+ ATPase in the basolateral membrane of the epithelial cells. Thus, the glomerular filtrate becomes more concentrated, which is one of the steps in forming urine.Basically, it is getting water into the kidneys. (Water follows sodium). In this way, many useful solutes (primarily glucose and amino acids), salts and water that have passed in the proximal tubule through the Bowman's capsule, return in the circulation. These solutes are reabsorbed isotonically, in that the osmotic potential of the fluid leaving the proximal tubule is the same as that of the initial glomerular filtrate. However, glucose, amino acids, inorganic phosphate, and some other solutes are reabsorbed via secondary active transport through cotransport channels driven by the sodium gradient out of the nephron.

Renin Angiotensin System:

1. The kidneys sense low blood pressure.

2. release renin into the blood.

3. Renin causes production of Angiotensins by the blood.

4. Angiotensins stimulate the adrenal cortex to release Aldosterone.

5. Aldosterone causes kidneys to reabsorb sodium.

6. Water follows sodium.

7. Blood volume goes up.

8. Blood pressure goes up.


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Look at other dictionaries:

  • réabsorption — [ reapsɔrpsjɔ̃ ] n. f. • 1795; de réabsorber ♦ Action de réabsorber, nouvelle absorption. ● réabsorption nom féminin Nouvelle absorption. réabsorption [ʀeapsɔʀpsjɔ̃] n. f. ÉTYM. 1795; de réabsorber, d après absorption. ❖ …   Encyclopédie Universelle

  • Reabsorption — Re ab*sorp tion (r[=e] [a^]b*s[^o]rp sh[u^]n), n. The act or process of reabsorbing. [1913 Webster] …   The Collaborative International Dictionary of English

  • reabsorption — (n.) 1755, from RE (Cf. re ) + ABSORPTION (Cf. absorption) …   Etymology dictionary

  • reabsorption — [spelling only] …   English World dictionary

  • reabsorption — pakartotinė sugertis statusas T sritis fizika atitikmenys: angl. reabsorption; resorption vok. Resorption, f rus. повторное поглощение, n; ресорбция, f pranc. résorption, f …   Fizikos terminų žodynas

  • reabsorption — /ree ab sawrp sheuhn, zawrp /, n. resorption (def. 2). * * * …   Universalium

  • reabsorption — noun a) The subsequent absorption of emitted radiation b) The subsequent absorption of a secreted substance …   Wiktionary

  • Reabsorption — Absorbing again. For example, the kidney selectively reabsorbs substances such as glucose, proteins, and sodium which it had already secreted into the renal tubules. These reabsorbed substances return to the blood. * * * re·ab·sorp·tion sȯrp… …   Medical dictionary

  • Reabsorption — Rückresorption …   Universal-Lexikon

  • réabsorption — (ré ap sor psion) s. f. Nouvelle absorption …   Dictionnaire de la Langue Française d'Émile Littré

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