This lesson will identify the role of the kidneys in maintaining homeostasis in extracellular fluids. It is 3 of 3 in the series titled "Urinary Homeostasis."

This lesson will identify the role of the kidneys in maintaining homeostasis in extracellular fluids.

This lesson will identify the major structures and functions of the urinary system. It is 1 of 4 in the series titled "Urinary System: Structure and Function."

Ever been asked to take a urine test? It may seem gross and embarrassing but doctors learn a lot from urine tests. [1:53]

KidsHealth explains how people get a urinary tract infection and provides related medical terms.