Question

Dialysing fluid has composition same as

• A. water
• B. plasma
• C. blood
• D. plasma without nitrogenous waste

Answer 1

The correct option is D plasma without nitrogenous waste

Humans use kidneys for excreting out nitrogenous wastes from the body. Due to certain diseases or injury, kidneys might become non functional. Kidney failure can result in accumulation of harmful substances in the body that can be fatal. Such patients usually undergo a procedure called hemodialysis to remove wastes from the body.
Hemodialysis unit contains a coiled cellophane tube (dialyzer) with the dialysing fluid. Dialysing fluid is similar to blood plasma in composition except for the nitrogenous waste.
Patient’s blood is drawn and pumped into the cellophane tube. Blood and dialysing fluid are separated by porous cellophane membranes. Due to the concentration gradient between blood and dialysing fluid, nitrogenous wastes move from plasma to dialysing fluid. The purified blood is transferred back to the patient's body.