The nephron and collecting system form the functional unit of the kidney.
The nephron consists of the renal corpuscle and renal tubule. Blood is filtered at the renal corpuscle, and the concentration and volume of the fluid are adjusted in the renal tubule and collecting system. Nephrons empty into the collecting system. The fluid leaves the collecting system as urine.
The following are the primary structures of the nephron:
The following are the primary structures of the collecting system: