Our kidneys are an amazing creation. They are more complex than we can imagine, and keep functioning with very little regard from us, until something goes wrong.
The two small organs are located in the lower back on each side of the spine. Their main purpose is to filter the blood and control the levels of potassium, salts, and acids.
The filtering structures are small clusters of blood vessels called glomeruli. When they are working properly, they allow the excretion of waste materials into the urine while retaining water, to keep you from dehydrating. There are different types of kidney disease that will hinder the work of the kidneys.