Kidney Disease (Renal Disease): Causes, Symptoms, & Treatments Link 2: DOWNLOAD [PDF] Link 2: Download [PDF] Our kidneys are some of the most essential organs in the human body. They serve a multitude of purposes, perhaps most importantly and notably as the main player in the urinary function of the body. Kidneys not only filter the blood in a body, but they also remove wastes and toxins for excretion, and maintain blood pressure by regulating a proper salt and water balance in the body. Kidneys also regulate various metabolic activities through their hormonal secretions, and maintain the acid-base balance in the body. Without our kidneys, our body would be unable to function at all, which is why kidney disease can be a tragic and dangerous condition. There are a number of different diseases that afflict the kidneys. Perhaps the most common is kidney stones, but chronic kidney disease is arguably the worst, in terms of the impact that it can have on your life, including bein