Human Excretory System and Urinary Function
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The Human Excretory System
All cells produce wastes and toxins; if these accumulate, they can be harmful. They must be eliminated through the function of excretion. The blood carries these substances to the organs responsible for their elimination. The organs involved in excretion include:
- The kidneys: They eliminate toxic substances through urine and form part of the urinary system.
- Lungs: They expel CO2.
- Liver: It eliminates wastes from medicines, drugs, and other substances by forming bile (which is also used in digestion).
- Sweat glands: They eliminate wastes through the production of sweat. Sweat is very similar to urine, but more diluted.
Anatomy of the Urinary System
The urinary system produces and expels urine. It consists of the following