Final answer:
The statement is false as hemodialysis is typically done three times a week, not four. Hemodialysis is a process where a machine filters the blood, removing waste products and excess fluid, acting as an artificial kidney for patients whose own kidneys have failed.
Step-by-step explanation:
The statement "Hemodialysis is done four times a week to maintain health." is false; hemodialysis is typically done three times a week, depending on the patient's needs. Hemodialysis is a necessary treatment for individuals whose kidneys can no longer perform their function of filtering waste from the blood. This treatment removes waste products, such as urea, and excess fluid from the bloodstream. It is done repeatedly because the body continuously produces waste that must be removed to maintain health. The procedure is usually performed on an outpatient basis for 3 to 4 hours at a time.
Patient size and other health factors determine the frequency and length of each hemodialysis session. During a session, a machine filters the patient's blood through a semipermeable membrane, effectively acting as an artificial kidney. Although dialysis is not a cure, it is a life-sustaining process for those awaiting a more permanent solution such as a kidney transplant.