1. Home
  2. Health
  3. Cancer

What exactly do the kidneys do in our body? Why do we need them?

By Lisa Fayed, About.com

Updated: November 26, 2005

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

Question: What exactly do the kidneys do in our body? Why do we need them?

Learning to understand the function of the kidneys may be easier to understand if you have a visual image of the kidneys.

Answer: The kidneys are an essential part of our urinary system. We have two kidneys, and they are located on either side of the spine in our lower back. They are about the size fo a fist and are bean shaped.

The primary function of the kidney is to filter wastes from our blood. About 50 gallons of blood enter our kidneys every day. They also process approximately two quarts of extra water and waste products.

The wastes that are filtered and extra water turn into urine. The urine then travels down tubes, called ureters and is stored in the bladder until excretion(urination).
More Cancer Q&A
Explore Cancer
About.com Special Features

Learn how you can reduce your your numbers with these nutrition and exercise tips. More >

Keep yourself, and your family, happy and healthy this fall with these tips. More >

We comply with the HONcode standard for trustworthy health information: verify here.
  1. Home
  2. Health
  3. Cancer
  4. Types of Cancer A-M
  5. Kidney Cancer (Renal Cell)
  6. FAQ Function of the Kidneys: What do the kidneys do?

©2009 About.com, a part of The New York Times Company.

All rights reserved.