Mechanism of Urine Formation Process in Nephron Kidney

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Mechanism of Urine Formation Process in Nephron Kidney - The kidneys are one of the vital organs inside the human body which is the excretory organs in vertebrates that have a shape like a peanut. The kidneys have a vital function in the human body. The kidneys are part of the urinary system, or urine, the kidneys filter impurities have as its main function is urea from the blood and then throw it out of the body along with the fluid in the form of urine. In the process of the formation of kidney a series of urine. Urine formation process includes 3 phases:

1. Stage filtration

Stage filtration. Stage filtration occurs in Malpighi bodies in which there is a very close glomerulus surrounded by Bowman's capsule. Filtration process: When blood containing water, salt, sugar, urea and other substances and blood cells and protein molecules enter the glomerulus, blood pressure becomes high to encourage water and the components that are not soluble, pore-pass pore glomerular capillary endothelium, except blood cells and protein molecules. Then towards the basement membrane and passes through the filtration plate, coming into the Bowman's capsule. Results of glomerular filtration and Bowman's capsule called the glomerular filtrate or primary urine. The primary urine contains: water, protein, glucose, amino acids, urea and inorganic ions. Glucose, inorganic ions and amino acids required by the body still.

2. Phase re-absorption

Phase re-absorption. Glomerular filtrate or primary urine through a stage that re-absorption occurs in the proximal convoluted tubule, and loop of Henley. This stage of the process carried out by the epithelial cells throughout the renal tubules. The amount of a substance that is reabsorbed depending on the needs of the body at that time. Reabsorbed substances include: glucose, amino acids, ions Na+, K+, Ca2+, Cl-, HCO3-, and HbO42-, whereas urea levels become higher. Reabsorption process, first enter the primary urine from the proximal convoluted tubule to glomerulus, then reabsorbed up to start the loop of Henley. Substances that are reabsorbed along the tubule is glucose, Na+ ions, water, and Cl- ions. Arriving in the loop of Henley, the filtrate volume was reduced. The results of this re-absorption stage called secondary urine or tubular filtrate. The content of the secondary urine is water, salt, urea, and bile pigment that gives color and smell function in urine. Secondary urine into the distal convoluted tubule and again absorption of substances which are not used and the excess water is absorbed to form urine.

3. Phase spending substance (augmentation)

Phase Expenditure (Augmentation). Urine distal convoluted tubule secondary to going down to the collecting ducts (tubular kolektivas). Kolektivas tubules, urine was taken to the renal pelvis and into the ureter to the bladder (urinary bladder).

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