People who suffer renal failure are treated with a medical process called dialysis. a dialysis machine carries out the role of the kidneys. explain the functions that a dialysis machine must perform in order to carry out the work of the kidneys. in your answer, include which structures of a working kidney carry out each function.

The kidneys are the organs  responsible for filtering the body from excess materials like salts and other by-products that can be found from ingesting food and medicines. Without the functions of the kidneys the body will get poisoned because it can't process such waste and bring it to the excretory system in the form of urine and feces. 

The dialysis machine acts out as kidneys in the body, when it is attached, blood is transfused into the machine and the machine filters the blood. As this happens, the blood is then returned to body clean and free from toxins.