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Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination1 Mark
MCQ
Dialysing unit (artificial kidney) contains a fluid which is almost same as plasma except that it has:
  • A
    High glucose.
  • B
    High urea.
  • C
    No urea.
  • D
    High uric acid.
✓

Answer

  1. No urea.

Explanation:

Artificial kidney, called dialysing unit, is a machine that is used to filter the blood of a person whose kidneys are damaged. The process is called haemodialysis. Dialysing unit has a cellophane tube suspended in a salt-water solution of the same composition as the normal blood plasma, except that no urea is present. Blood of the patient is pumped from one of the arteries into the cellophane tube. Pores of the cellophane tube allow urea, uric acid, creatinine, excess salts and excess H+ ions to diffuse from the blood into the surrounding solution. The blood thus purified is then pumped into a vein of the patient.

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