The kidneys are organs with several functions. They are seen in many types of animals, including vertebrates and some invertebrates. They are an essential part of the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid-base balance, and regulation of blood pressure. They serve the body as a natural filter of the blood, and remove wastes which are diverted to the urinary bladder. Alternative Names: Human Kidney Tissue Lysate, Kidney Lysate, Human Kidney Lysate, Normal Human Kidney Lysate