How are electrolytes lost in sweat/why is salt?

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Sweating serves to cool the body, primarily through the evaporation of water. Along with water, sweat contains urea and electrolytes, including salt, which are excreted as waste. The presence of salt in sweat is due to the body's need to regulate electrolyte balance; as sweat is produced, it draws electrolytes like sodium from the bloodstream. This process highlights the interconnectedness of water and electrolyte movement in the body, as water often carries these electrolytes during sweating.
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I understand that when you sweat, the water is to cool you and urea is excreted because it's a waste, however I don't know why salt is excreted, nor to I know how electrolytes are used in the process of sweating. Would someone care to enlighten me?
 
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probably because the water your are sweating is not pure. it is coming out of your body and it is picking up electrolytes as it comes out.
 
Yes and water moves with Na and v/v.

Nautica
 

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