If both liver and kidneys are cleaning the blood, what’s the difference between them?
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Very simply put: The liver is the first filter for blood; food goes from the stomach to the small intestine, the blood (or things needed to created blood) in the small intestine maintains an imbalance that “has to be righted” so, blood is pulled out of that mix and goes into the liver. The liver is more diverse in its functions than the kidneys in that it processes *everything (aside from many “toxins”)* to make them more useful for various organs. One of its function is to break down nitrogenous substances into urea to send to the kidneys. The kidneys separate the urea and some other toxins from useful compounds. The useful nutrients from the blood go back to the body, the harmful ones (urea, some toxins) are excreted through urine. As liver function declines so does its efficacy in differing between substances, therefore, some that shouldn’t make their way to the kidneys manage it. As you can imagine, the kidneys, unprepared as they are for this sudden onslaught, experience difficulties.
Kidneys therefore function, simply, to separate urine and useful blood nutrients post processing by the liver. The liver functions as a primary filter that sends compounds from the blood garnered from within the digestive process to the kidneys (and many other organs) that the kidneys are capable of processing. Acting as a control center for blood within the digestive tract, it processes nutrients for “transfer” into the bloodstream and towards various organs. Those organs include the brain, which is why getting “high” is possible; your liver sends a cavalcade of compounds to the brain and central nervous system, eliciting a reaction.
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