Urine is usually filtered out by the glomeruli to form primary urine into the ureters as well as the bladder, which is excreted from the body through the urethra. The formation of urine usually requires the participation of the kidneys, which are usually composed of several basic units such as the renal tubules and glomeruli. When the blood in the body passes through the kidneys, the impurities in the blood may be filtered out to form the primary urine, and the useful components will be reabsorbed to form the final urine. The formed urine may pass through the renal pelvis into the ureter, and then be transported to the bladder through the ureter, and temporarily stored in the bladder, after the bladder urine volume increases, it will induce the urinary reflex, and excreted through the urethra. In the case of drinking too much water and sweating less, the amount of urine may increase, if drinking too little water or sweating more, the amount of urine excreted will decrease.