Final answer:
Hemodialysis is a medical procedure used to filter toxins (option D) and remove excess fluids (option D) from the blood of patients with kidney failure, mimicking the function of a healthy kidney.
Step-by-step explanation:
Hemodialysis is a medical procedure for patients with kidney failure where a machine called an artificial kidney or dialysis machine is used to filter out toxins and remove excess fluids from the blood. During this process, the patient's blood flows through cellophane tubes which act as a semipermeable membrane, allowing waste materials such as urea to pass through while preventing larger molecules such as proteins and blood cells from exiting the bloodstream.
The purpose of hemodialysis is to perform the vital functions that a healthy kidney would normally handle, thus it is utilized to filter waste products and remove excess water that the kidneys can no longer manage effectively.