Kidney function:
1. Excretory. Kidneys are excreted from the body:
a) end products of catabolism (for example, products of nitrogen metabolism such as urea, uric acid, creatinine, as well as products of the neutralization of toxic substances).
b) an excess of substances absorbed in the intestine or formed during catabolism: water, organic acids, vitamins, hormones, and others.
c) xenobiotics – foreign substances (drugs, nicotine).
2. Homeostatic Kidney regulated:
a) water homeostasis
b) salt homeostasis
c) acid-base state
3. Metabolic:
a) participation in carbohydrate, protein, fat metabolism
b) the synthesis in the kidneys of some biologically active substances: renin, the active form of vitamin D3, erythropoietin, prostaglandins, kinins. These substances affect the regulation of AD, blood coagulation, calcium-phosphorus metabolism, the maturation of red blood cells, and other processes.

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