Final answer:
Continuous ambulatory peritoneal dialysis (CAPD) involves the circulation of a patient's blood through an artificial kidney machine to remove metabolic waste and excess ions. It is a medical procedure used to treat kidney failure.
Step-by-step explanation:
Continuous ambulatory peritoneal dialysis (CAPD) is a medical procedure used to remove metabolic waste and excess ions from a patient's blood. It involves the circulation of the patient's blood through an artificial kidney machine. In CAPD, a section of tubing composed of a semipermeable membrane is immersed in a dialysate solution. This allows waste molecules and excess water to pass through the membrane into the dialysate, while red and white blood cells remain in the blood.