Skip to content

    Incontinence & Overactive Bladder Health Center

    Image Collection:

    Human Anatomy

    Picture of the Human Kidney

    Picture of the Kidneys

    back button next button

    © 2014 WebMD, LLC. All rights reserved.

    The kidneys are a pair of organs located in the back of the abdomen. Each kidney is about 4 or 5 inches long -- about the size of a fist.

    The kidneys' function are to filter the blood. All the blood in our bodies passes through the kidneys several times a day. The kidneys remove wastes, control the body's fluid balance, and regulate the balance of electrolytes. As the kidneys filter blood, they create urine, which collects in the kidneys' pelvis -- funnel-shaped structures that drain down tubes called ureters to the bladder.

    Each kidney contains around a million units called nephrons, each of which is a microscopic filter for blood. It's possible to lose as much as 90% of kidney function without experiencing any symptoms or problems.

    1 | 2 | 3

    Today on WebMD

    womens restroom sign
    Symptoms, causes, and treatments.
    hand over mouth
    Test your urine knowledge.
     
    man breathing with mouth open
    Is it true that men can do kegels?
    bathroom sign running
    Assess your symptoms.
     
    woman holding water
    Slideshow
    Food That Makes You Gotta Go
    Slideshow
     
    Male Incontinence Slideshow
    Slideshow
    Mature woman standing among peers
    Article
     
    Worried in bed
    Article
    woman standing in front of restroom sign
    Slideshow
     
    various pills
    Video
    sitting in chair
    Article