How is urine formed?
Apr 24, 2023
Source: Cainiu Health
Dr. Zhao Xinju
Introduction
Urine is primarily formed through the filtration system of the glomerulus and the reabsorption function of the renal tubules. It begins when blood circulates to the kidneys, where bodily fluids and blood are filtered by the glomerular filtration system, removing most large-molecule substances such as proteins, thus forming primary urine. This primary urine then enters the renal tubules, where approximately 99% of it is reabsorbed by the tubules.
Urine is primarily formed through the filtration system of the glomeruli and the reabsorption function of the renal tubules. The specific process is as follows:
Urine formation begins with blood circulation carrying water and other substances into the kidneys. As blood passes through the glomerular filtration system, most large molecules such as proteins are filtered out, forming what is known as primary urine. This primary urine then enters the renal tubules, where approximately 99% of it is reabsorbed. The remaining fluid becomes urine, which is eventually excreted from the body. However, if glomerulonephritis or inflammation of the glomeruli occurs, the filtration barrier may become compromised, allowing large proteins to leak into the urine. Additionally, metabolic waste products such as creatinine from the renal tubules are also excreted in the urine. These abnormalities can be detected through routine urinalysis.
The human urinary system consists mainly of the kidneys, bladder, ureters, and urethra. The kidneys are responsible for urine formation, the bladder stores urine, while the ureters and urethra serve as organs that transport and expel urine from the body. If disorders occur within the urinary system, individuals may experience difficulty urinating or pain during urination. Therefore, it is recommended to maintain good hygiene of the genital area in daily life to help prevent urinary tract diseases.
