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Haemodialysis is done in the patients whose kidneys become completely non-functional. Haemodialysis is the process of diffusion across a semipermeable membrane to remove unwanted substances from the blood while adding derivable components. The dialysis unit consists of a coiled cellophane tube kept it the dialysing fluid. The membrane of the tube is impermeable to blood cells and proteins but permeable to urea, uric acid, creatinine and mineral ions.

So, the correct answer is 'The dialysis unit has a coiled cellophone tube'.