The primary structures of the urinary system include the kidneys, ureters, bladder, and urethra. Learn about the complex role of the kidneys, how urine drains into the ureters, and just how much the adult bladder can hold. Learn the main differences between the female and male urethra.
Blood and waste play a large role in the processes of filtration, reabsorption, and secretion. What’s a proximal convoluted tubule? Where does the exchange of gas, nutrients, and waste between blood and tissue take place? What does the filtration membrane do? Read on to learn about the back and forth of how urine is formed.