Each kidney has an outer layer called the cortex, which contains filtering units. The center part of the kidney, the medulla, has fan-shaped structures called pyramids. These drain urine into cup-shaped tubes called calyxes.
<h2>Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and</h2><h2> removes wastes.</h2>
