National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Urinary System
Self-guided learning activity where students learn about the structure and function of the human urinary system. There is a short quiz at the end of the lesson to check for understanding.
OpenStax
Open Stax: Anatomy & Physiology: Water Balance
Learn how water levels in the body influence the thirst cycle and body fluid regulation. Find out about dehydration and identify common causes of dehydration.