Kidneys are a continuously working as a filter that pours about a liter of blood per minute. But the function of the kidneys is not limited to filtration – extraction from the blood of the waste dissolved in it. The kidneys regulate the volume of blood and extracellular fluid, maintain ion balance, acid-base balance (pH), and perform many other important tasks.
A condition in which the kidneys as a result of a disease lose the ability to perform well their functions, doctors call chronic kidney failure. In fact, this means chronic poisoning of the body with products of its own vital activity in combination with arterial hypertension (disturbed water-salt balance!) And metabolic (metabolic) disorders. These effects can also be caused by kidney stones, by the way, what does a kidney stone look like?