Reabsorption
Reabsorption
Reabsorption (/riːəbˈsɔːrpʃən/) is a biological process that occurs in the kidney where certain molecules and ions are removed from the urine and returned to the blood.
Etymology
The term "reabsorption" is derived from the prefix 're-' meaning 'again' and the Latin word 'absorptio' meaning 'suck in'.
Process
Reabsorption primarily takes place in the renal tubules of the kidney. The process begins when molecules and ions are filtered out of the blood and into the tubular fluid. These substances are then reabsorbed back into the blood, thus preventing their loss in the urine.
The substances that are reabsorbed include glucose, amino acids, and sodium ions. The process of reabsorption is selective, meaning that only certain substances are reabsorbed based on the body's needs.
Related Terms
- Glomerular filtration: The first step in urine formation where water and solutes are filtered out of the blood and into the glomerular capsule.
- Tubular secretion: The process where certain molecules are actively secreted from the blood into the tubular fluid to be excreted in the urine.
- Nephron: The functional unit of the kidney where reabsorption, along with filtration and secretion, takes place.
- Renal physiology: The study of kidney function, including the process of reabsorption.
External links
- Medical encyclopedia article on Reabsorption
- Wikipedia's article - Reabsorption
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