The bladder (vesica urinaria) is an unpaired hollow organ that serves as a reservoir for urine, which is discharged from the bladder through the urethra.
The ureter starts from the narrowed part of the renal pelvis and ends up in the bladder. The function of the ureter is to remove urine from the kidney into the bladder.
The kidney (ren, Greek nephros) is a paired excretory organ that forms and removes urine. Kidney bean-shaped, dark red, dense consistency. The size of the kidney in an adult is as follows: length 10-12 cm, width 5-6 cm, thickness 4 cm.
