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You have kidneys to filter your blood of the waste chemical urea, which is a less toxic form of the nitrogenous wastes produced by various metabolic processes in your body, as well as to provide your blood with optimal levels of salts and water.
Humans have kidneys because kidneys help filter the urine system and other organs in the body.
It produces hormones that control salt and water content and has other functions in the body.

It filters other wasted material from the blood.

It gets rid of excess water or reduces water output when the body water content is short.
Your kidney's filter you blood and excrete nitrogenous wastes, they also reabsorb needed substances such as water, sodium, potassium, glucose, among many others.
They filter everything we eat and decide what the body keeps and what the body has to get rid of.

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Al Leuschke

Lvl 10
3y ago

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