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Which one of the following is correct with reference to hemodialysis?
A. Absorbs and resends excess of ions
B. The dialysis unit has a coiled cellophane tube
C. Blood is pumped back through a suitable artery after hemodialysis
D. Nitrogenous waste is removed by active.

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Last updated date: 22nd Jun 2024
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Answer
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Hint:Haemodialysis or hemodialysis is a type of dialysis process through which blood is purified with the help of a machine in patients whose kidneys fail to work properly. It removes waste products such as creatinine, urea, water from the blood. The basic principle of dialysis is the diffusion of solutes and ultrafiltration of fluid across a semipermeable membrane.

Complete answer:Option A- Absorbs and resends excess of ions
This process involves the removal of excess ions from the blood, not absorption. So this option is incorrect.
Option B- The dialysis unit has a coiled cellophane tube
The blood is drained from an artery into the dialysis unit which consists of a coiled cellophane tube. The tube is porous and surrounded by dialyzing fluid which is the same in composition as that of plasma except for the nitrogenous waste. The porosity of the tube acts as a permeable membrane which allows the substances to move freely across it and the purification takes place. Then the blood is pumped back into the body through a vein.
Option C- Blood is pumped back through a suitable artery after hemodialysis
Blood is not pumped back through an artery but a vein. So this option is incorrect.
Option D- Nitrogenous waste is removed by active
Nitrogenous waste is removed by diffusion, not by active transport. So this option is incorrect.

Thus, the correct option is option B- The dialysis unit has a coiled cellophane tube.

Note: Before the blood is pumped into the dialysis unit, an anticoagulant is added such as heparin. And before pumping the blood into the body, anti-heparin is added. This process is not only expensive for the patient but he/she also needs to take care of the routine as they have to follow it three-four times a week.