The kidneys are two bean-shaped organs that are located in the back of the abdominal cavity, according to WebMD. The organ pair sits against the back muscles in the lower back.
The kidneys are essential organs that are utilized by the body to filter blood and urine, according to WebMD. Every blood cell in the human body passes through the kidney as some point. As blood passes through the kidneys, it goes through a series of vessels as it is filtered. The kidneys remove waste products from the blood and then help the body excrete the waste products through urine.