This lecture focus to presentation on Urinary System in human body. Other objectives are identify and describe the components of the urinary system and their function and Describe the histological organization of the nephron. Finally identify the blood vessels that supply blood to the nephrons and analysis the blood flow through and around the nephron. This lecture briefly explain functions of Urinary System: Urinary System regulate fluid balance of the body, excrete organic waste products and conserve nutrients, etc also Stabilize pH and regulate ion concentrations in the blood.