Which of the following statements about dialysis is incorrect?

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Blood drained from a convenient artery is pumped into a dialysing unit after adding an anticoagulant like heparin.

The dialysing unit contains a coiled cellophane tube surrounded by a dialysing fluid.

The cleared blood is pumped back to the body through a vein after adding anti-heparin to it.

The dialysing fluid have the exactly the same composition as that of plasma.

answer is D.

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Detailed Solution

The dialysing fluid has same composition as plasma except for nitrogenous wastes (urea). This help in clearing excess urea from the blood and thus purify it.The dialysate is specially formulated to maintain diffusion gradients that remove wastes from the blood (such as urea, creatinine, uric acid, excess phosphate, potassium,and sulfate ions) and add needed substances (such as glucose and bicarbonate ions) to it.

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