What is uraemia? Name and describe the process used to remove waste substances from individuals suffering from uraemia.
Uraemia is the accumulation of urea in the blood due to malfunctioning of the kidneys.
In individuals suffering from uraemia, the waste substances are removed by haemodialysis.
In this process, blood is drained from the convenient artery (usually radial artery), mixed with anticoagulant such as heparin and pumped into the dialysing unit.
The dialysing unit consists of a coiled tube surrounded by a dialysing fluid.
The dialysing unit has the same composition as that of the plasma membrane, but it does not contain any nitrogenous waste.
The absence of nitrogenous water in the dialysing unit enables the easy movement of waste from urine into the tube through the porous membrane, thus clearing the blood from any waste.
The cleared blood is then pumped back into the body through the same vein after adding anti-heparin.
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