Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination5 Marks
Question
Describe the process of hemodialysis.
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Answer
Blood from the artery of an uremia patient is taken, cooled to 0°C and mixed with an anticoagulant like heparin.
It is put into the cellophane tubes of the artificial kidney, where cellophane is permeable to micromolecules, but not to macromolecules like plasma protein.
Outside the cellophane tube is the dialysing fluid, which has the same composition as that of plasma except the nitrogenous molecules like urea, uric acid, creatine, etc.
Hence, the nitrogenous molecules from within the cellophane tubes flow into the dialysing fluid, following concentration gradient. (dialysis)
The blood coming out of the artificial kidney is warmed to body temperature, mixed with antiheparin and restored to a vein of the patient.
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