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National Institutes of Health
Niddk: Your Kidneys and How They Work
This resource provides a detailed description of both structure and function of the kidneys, the role they play in the urinary system, as well as provides information about kidney disease.
National Institutes of Health
Niddk: The Urinary Tract & How It Works
This is an in-depth discussion on how the urinary system works. Also includes information about what can go wrong in the urinary system and how someone can get help.