Find out how to distinguish kidney pain from back pain. Learn about symptoms, possible causes, and when medical care is necessary. This article covers the anatomy of the kidneys, their function and internal structure together with the nephron. Learn more and see the diagrams at Kenhub! kidney, in vertebrates and some invertebrates, organ that maintains water balance and expels metabolic wastes. Primitive and embryonic kidneys consist of two series of specialized tubules that empty into two collecting ducts, the Wolffian ducts (see Wolffian duct). The more advanced kidney (metanephros) of adult reptiles, birds, and mammals is a paired compact organ whose functional units. Chronic kidney disease is a disease characterized by progressive damage and loss of function in the kidneys. It's estimated that chronic kidney disease affects about one in seven American adults. And most of those don't know they have it. Before we get into the disease itself, let's talk a little bit about the kidneys and what they do. Kidney Disease: There are several types of acute kidney problems and chronic kidney diseases leading to kidney failure. Learn more in this guide. 37 million people in the U.S. have kidney disease but only 10% know it. NKF is a lifeline for all people affected by kidney disease—the largest public health issue you'll ever hear about. Each kidney is attached to a ureter, a tube that carries excreted urine to the bladder. The kidney participates in the control of the volume of various body fluids, fluid osmolality, acid–base balance, various electrolyte concentrations, and removal of toxins. The kidneys are essential for balancing the body’s internal environment. If they do not work properly, problems can arise with various bodily functions. Learn more here. Learn how your kidneys filter blood, why kidneys are important, and how kidneys help maintain a healthy balance of water, salts, and minerals in your body. A kidney is an organ that constantly cleans your blood. Learn more about how your kidneys work.