The main waste component present in the blood, that needs to be filtered when the blood passes through the dialysing fluid of a dialysis machine is:

Cellulose

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Glucose

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Water

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Urea

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Solution

The correct option is D Urea
The dialysing fluid has the same components (glucose, water, electrolytes, etc.) as that of blood, except the nitrogenous waste - urea. During the dialysis procedure, the patient’s blood is passed through the tubes suspended in a tank filled with the dialysing fluid. These tubes are lined with a semi-permeable lining. During this passage, the nitrogenous waste product (urea) from the blood passes into the dialysing fluid by diffusion. The purified blood (without urea) is then pumped back into the patient's body.
So, the correct answer is D

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(i) Of what substance are the tubes made ?
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