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Transcript for The Urinary System
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| Time | Content |
|---|---|
| 00:00 → 00:07 |
The urinary system is concerned with the formation and elimination of urine |
| 00:07 → 00:11 |
In an adult, more than 2,500 pints of blood |
| 00:11 → 00:13 |
pass through the kidneys each day. |
| 00:13 → 00:16 |
Blood enters via the renal arteries |
| 00:16 → 00:20 |
and is filtered to remove most of the waste products of metabolism. |
| 00:20 → 00:24 |
Seven pints of filtrate are produced every hour. |
| 00:24 → 00:29 |
Purified blood returns to the body circulation via the renal veins. |
| 00:29 → 00:34 |
The filtering process is carried out by more than two million tiny kidney units, |
| 00:34 → 00:38 |
nephrons, which produce a highly concentrated solution of chemicals |
| 00:38 → 00:42 |
known as urine, which is harmful to the body if allowed to remain. |
| 00:42 → 00:44 |
Urine flows from the nephrons, |
| 00:44 → 00:47 |
first into the funnel-shaped renal pelvis |
| 00:47 → 00:50 |
and then into the ureter. |
| 00:50 → 00:53 |
Waves of muscular contraction passing down the ureters |
| 00:53 → 00:55 |
push the urine into the bladder |
| 00:55 → 00:59 |
With continuous filling, the bladder, a muscular bag, |
| 00:59 → 01:02 |
expands until it holds about one pint of fluid. |
| 01:02 → 01:05 |
A circular band of muscle around the neck of the bladder, |
| 01:05 → 01:10 |
the sphincter, controls the release of urine from the body. |