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We excrete CO2, sweat, urine, and feces.

CO2 is pretty obvious.

Sweat is used to get rid of excess heat by evapo-transpiration. We also lose some water in our breath.

Urine disposes of nitrogen in urea, for we have little use for the nitrogen produced by the metabolism of proteins. Urine also contains excess water, and various salts and metabolites not wanted by the body.

Feces dispose of solid waste not needed by the body. This may still contain quite usable material. The lower bowel actually does its best to conserve the water we have in our body. [When this mechanism fails, we get diarrhoea. ]

Tears and breast milk would not be considered excretory in the above company, nor would sexual fluids.

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Kyla Klocko

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Q: What are the three main function of the excretory system?
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