Final answer:
True, dialysis involves removing waste molecules from the blood via diffusion through an artificial semipermeable membrane, simulating kidney function.
Step-by-step explanation:
The statement that dialysis is the process in which waste molecules are removed from the blood by having them diffuse through an artificial porous membrane is true. During hemodialysis, a patient's blood is passed through tubing within an artificial kidney or dialysis machine. As the blood traverses a semipermeable membrane, waste products like urea, and excess water are forced through the membrane into the surrounding dialysate due to osmotic pressure. Larger molecules like red and white blood cells are unable to pass through this membrane, ensuring that only waste molecules are filtered out. This process mirrors the natural function of kidneys but relies on an external system to maintain the balance of substances in the blood when the kidneys have failed or are impaired.