Your kidneys are a pair of organs in your abdomen. Each kidney is about the size of a fist.
Your kidneys are part of the urinary tract. They make urine by removing wastes and extra water from your blood.
Urine collects in a hollow space (renal pelvis) in the middle of each kidney. Urine passes from your renal pelvis into your bladder through a long tube called a ureter. Urine leaves your bladder through a shorter tube (the urethra).
This picture shows the kidneys and nearby tissues in a man.
This picture shows the kidneys and nearby tissues in a woman.
Your kidneys also make substances to help control blood pressure and to make red blood cells.
Attached to the top of each kidney is an adrenal gland. A layer of fatty tissue and an outer layer of fibrous tissue surround the kidney and adrenal gland.
This picture shows the kidney and adrenal gland.