Kidney and Urinary Tract

The role of the urinary system is to cleanse the blood. Arterial blood is filtered through the kidneys and returned to the circulation. Learn more about how the urinary system monitors the concentration of salts and other necessary nutrients.

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Having kidney stones can feel like you've been stabbed in the back. But is it the stones causing the searing pain or is it something else?

By Dave Roos

When we've really got to urinate, kids and adults alike do the pee-pee dance. What are the theories behind the fidgeting?

By Jesslyn Shields

If you find yourself running to the bathroom the minute you get home, experts posit this is a case of mind over bladder.

By Alia Hoyt


"Pee on it" has long been the advice for a jellyfish sting or even a regular cut if nothing else is available. But is this really the best advice?

By Laurie L. Dove

Now and then, we all have to suppress nature's call, sometimes until it hurts. But could holding your pee for a long time have serious consequences?

By Laurie L. Dove

The kidneys spend 24 hours a day, seven days a week filtering gallons and gallons of blood. But that's not all these little bean-shaped organs accomplish in a day.

By Craig Freudenrich, Ph.D.