Selective reabsorption
Selective Reabsorption
Selective reabsorption (pronunciation: /sɪˈlɛktɪv riːəbˈsɔːpʃən/) is a process that occurs in the kidneys that ensures that essential substances, such as glucose and amino acids, are reabsorbed back into the blood from the glomerular filtrate.
Etymology
The term 'selective reabsorption' is derived from the English words 'selective', meaning to choose or make a selection, and 'reabsorption', which refers to the process of absorbing something that has already been absorbed.
Process
Selective reabsorption primarily occurs in the proximal convoluted tubule of the nephron in the kidneys. The process begins when the glomerular filtrate, which contains both waste products and useful substances, passes into the proximal convoluted tubule. Here, essential substances such as glucose, amino acids, and ions are reabsorbed back into the blood through active transport. The remaining waste products continue their journey to be excreted in the urine.
Related Terms
- Active transport: The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
- Glomerular filtrate: The liquid that has been filtered out of the blood by the glomeruli of the kidney.
- Proximal convoluted tubule: The portion of the duct system of the nephron of the kidney which leads from Bowman's capsule to the loop of Henle.
See Also
External links
- Medical encyclopedia article on Selective reabsorption
- Wikipedia's article - Selective reabsorption
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