Summary of Au coeur des organes : L'excrétion urinaire

The video explains the process of urinary excretion, focusing on how organs produce waste and how the body eliminates it:

Organs generate waste products such as carbon dioxide and urea during their functioning.
These wastes are transported via the blood; accumulation of waste is toxic, so blood must be purified.
carbon dioxide is expelled through the lungs.
Other wastes are filtered out by the kidneys.
Approximately 5 liters of blood circulate through the kidneys 36 times daily, totaling about 180 liters filtered per day.
Blood entering the kidneys contains impurities that are filtered by microscopic units called nephrons (over one million per kidney).
nephrons filter waste and excess water to form urine.
Urine consists of about 95% water and contains waste products.
Humans produce about 1.5 liters of urine daily, which contributes to the body's water requirements of over 2 liters per day.
Urine travels from the kidneys through the ureters to the bladder, where it is stored.
When bladder volume exceeds 200 ml, the bladder wall stretches, triggering the urge to urinate.
Muscle relaxation allows urine to flow through the urethra and be expelled from the body.

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