Reabsorbe

Reabsorbe is a rarely used English form; more common spellings are reabsorb and reabsorption. It refers to the act of absorbing something again or returning a substance to the body or system after initial release.

In physiology, reabsorption is a key process in the kidneys. In the nephron, many filtered substances are reabsorbed from the tubular fluid back into the bloodstream. The proximal tubule reclaims glucose, amino acids, bicarbonate, and a large portion of water and electrolytes. The loop of Henle concentrates urine by reabsorbing water in the descending limb and ions in the ascending limb. The distal tubule and collecting duct adjust final reabsorption rates under hormonal control, notably aldosterone increasing sodium reabsorption and antidiuretic hormone (vasopressin) promoting water reabsorption. Reabsorption is essential for fluid balance, electrolyte homeostasis, and waste management.

In medicine and pharmacology, reabsorption describes the return of substances from filtrate or gut contents into the circulation. Renal reabsorption can affect drug clearance and half-life; intestinal enterohepatic recirculation involves reabsorption of bile acids and certain drugs, influencing duration of action.

In chemistry and environmental science, reabsorption can refer to the uptake or return of a substance into a phase or medium after an initial release, such as in porous materials or membranes, though terminology varies by field.

Etymology: from Latin re- “again” + absorbere “to take in.” The noun form is reabsorption, and English commonly uses reabsorb for the verb.