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What Does The Bladder Do?

Updated on May 16, 2012
Picture courtesy of 3DScience.com
Picture courtesy of 3DScience.com
Interior view of the urinary bladder - Gray's Anatomy, 1918.
Interior view of the urinary bladder - Gray's Anatomy, 1918.

The Bladder

The urinary bladder is a balloon-shaped organ which stores urine excreted by the kidneys.

It is located on the pelvic floor, and in an adult can hold over a pint (0.6 litres) of urine.

Urine passes from the kidneys, through two tubes called the ureters to the bladder. When the bladder is about half full, the build up of pressure stimulates nerves to relax the sphincter muscles at its base, which we can feel and are usually able to control until the bladder is full.

When we urinate, muscle layers in the bladder contract, expelling urine through another tube called the urethra and out of the body.

The bladder is made up of a number of layers.

The inside lining, called the transitional epithelium, can stretch as the bladder fills and stops the urine being absorbed back into the body. Below this lining is a thin layer of connective tissue called the lamina propria. Underneath this is a layer of muscle tissue called the muscularis propria. The outer layer is another area of connective tissue that is fatty and separates the bladder from other body organs such as the kidneys.

Release of Urine

The Urinary System

Did You Know ... ?

  • People often urinate when laughing or frightened because they temporarily lose control of the muscle which closes the urethra (tube from the bladder), so a little urine can flow out.
  • Incontinence affects nearly 13 million adults, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

Location of the Bladder

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      a guy 4 years ago

      this is going to help my science work

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      SexyLexy 5 years ago

      Thanks So Much!

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      nothing 5 years ago

      it really helped

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      Shaimirror 5 years ago

      I like it i really helped me with my project thanks ! :)

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      paiige 6 years ago

      thankks helped me loads with my health n social course work

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      Bridgette 6 years ago

      Science work DONE

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      beth! 6 years ago

      didn't help!:L

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      Justin Bieber's Girl22 6 years ago

      Really helpful for my science project! Thanks sooo much! Ps. The videos were pretty great xD

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      gabriel 6 years ago

      thx guys! its really gonna help with my sciense homework!!!!

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      ruler 7 years ago

      thank you this really helped me...

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      Jamie 7 years ago

      I thin this will help people who will want to be a doctor.

      Very good writing. Do you want to be a doctor or nurse?

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      Taylor 7 years ago

      Cool. This will help

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      Jewels 8 years ago from Australia

      Informative, thanks for writing it.