The Urinary System

Duration: 1 minute and 10 seconds

Country: United States

Language: English

License: CC - Attribution Non-commercial No Derivatives

Genre: Trailer

Views: 385 (97 embedded)

Posted by: lolaceituno on Nov 18, 2008

The function of the kidneys in the Urinary System

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The urinary system is concerned with the formation and elimination of urine
In an adult, more than 2,500 pints of blood
pass through the kidneys each day.
Blood enters via the renal arteries
and is filtered to remove most of the waste products of metabolism.
Seven pints of filtrate are produced every hour.
Purified blood returns to the body circulation via the renal veins.
The filtering process is carried out by more than two million tiny kidney units,
nephrons, which produce a highly concentrated solution of chemicals
known as urine, which is harmful to the body if allowed to remain.
Urine flows from the nephrons,
first into the funnel-shaped renal pelvis
and then into the ureter.
Waves of muscular contraction passing down the ureters
push the urine into the bladder
With continuous filling, the bladder, a muscular bag,
expands until it holds about one pint of fluid.
A circular band of muscle around the neck of the bladder,
the sphincter, controls the release of urine from the body.

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