Excretory System (Substances)

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Substances

Carbon Dioxide :

The main substance excreted from our body by the lungs. Waste product of cellular respiration.

Urea :

Product of the filtration of the blood. Filtered by the kidneys and excreted by the Urinary System.

Water :

Used to regulate the skin temperature and as a medium to excrete other substances

Salt :

Excreted in the sweat to regulate skin temperature.

Iron :

This is excreted by our intestine, this is the substance that makes feces look brownish. The iron is from the dead red blood cells excreted.


This substances are the main and most important because the total would be incalculable. Just with urine we got arround 15 different substances. This were the main or at least the ones I thought we see most commonly.

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