Kidney Kidney The kidneys are two bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about in length. They receive blood from the paired renal arteries; blood exits into the paired renal veins. Each kidney is attached to a ureter, a tube that carries excreted urine to the bladder. The nephron is the structural and functional unit of the kidney. Each adult kidney contains around 1 million nephrons. The nephron utilizes four processes to alter the blood plasma which flows to it: filtration, reabsorption, secretion, and excretion. The
Bladder tank open surface free of rocks or other materials that might damage the walls. A fine layer of sand or a special ground cloth is often used to minimize surface irregularities. Ground cloths are generally made from a geotextile fabric designed to minimize the chance of abrasion and tank failure. Bladder tanks are lightweight, flexible, mobile and can last for many years. The materials used to make bladder walls are recyclable and can be re-used for other purposes. Bladder tanks have capacities up to 1,000 cubic meters. Liquid stored in a flexible bladder tank does not evaporate and any odor it