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What is a urinife
The structure of the kidney is such that it is made up of numerous minute tubules called uriniferous tubules. These tubules form the structural as well as the functional units of a kidney. The blood that flows into the glomerulus under great pressure which is much greater than in the capillaries elsewhere, this high pressure causes the liquid part of the blood to filter out from the glomerulus into the renal tubule. This filtration under force is ultrafiltration. During ultrafiltration almost all the liquid part of the blood comes out the glomerulus and passes into the funnel-shaped cavity of the Bowman’s capsule, the fluid entering the renal tubule is called the glomerulus filtrate consist of water, urea, salts, glucose and other plasma. Therefore, the blood that comes out of the glomerulus is relatively thicker. The glomerular filtrate that enters the renal tubule is not urine. It is just an extremely dilute solution that contains several usable materials - glucose, salts such as sodium. As this filtrate passes down into the tubule, more water is reabsorbed, however, keeping the concentration of blood in check. This process is termed selective reabsorption.
A Certain substance like Potassium ions and another large number of foreign chemicals including drugs like penicillin are passed into the forming urine in the distal convoluted tubule. This passage involves the activity of the cells of the tubular wall, and hence it is called tubular secretion.
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