Reabsorption

Reabsorption is the process by which a substance is absorbed again after having been previously absorbed or released. This term most commonly applies to the kidneys, where essential nutrients, water, and electrolytes are reabsorbed from the filtrate back into the bloodstream. It is a vital biological mechanism ensuring the conservation of valuable resources and maintaining homeostasis within the body. The efficiency of reabsorption can be influenced by various factors, including hormonal signals and the presence of diseases.

Reabsorption meaning with examples

• In the nephrons, the process of reabsorption ensures that glucose is returned to the blood, preventing its loss in urine and providing the body with a crucial energy source. This active transport mechanism, facilitated by specialized transporter proteins, conserves valuable resources.
• Patients with kidney dysfunction might experience reduced reabsorption of essential electrolytes like sodium, leading to imbalances that require careful medical management. Impaired reabsorption can have serious effects.
• The intestinal villi are responsible for the reabsorption of digested nutrients from the small intestine into the bloodstream. This absorption mechanism effectively transfers nutrients for the body's cells to use.
• Following a significant dehydration episode, the kidneys increase their reabsorption of water to conserve fluid volume. This adaptation helps prevent further fluid loss and restore balance in the body.
• Scientists are studying ways to improve the reabsorption of therapeutic antibodies in certain drug delivery systems, to improve drug efficacy and minimise its effect on the patient. This would increase the drugs ability to heal.