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In haemodialysis, wastes are removed from the patient's blood by the principle of:
ADiffusion through a semi-permeable membrane
BActive transport using ATP-driven pumps
CFiltration via a high-pressure pump
DCentrifugation of blood components
Answer & Solution
Correct answer: A. Diffusion through a semi-permeable membrane
Haemodialysis uses DIFFUSION across a semi-permeable membrane. Patient's blood + dialysate (clean fluid) flow on opposite sides; wastes diffuse out, valuable solutes stay. No filtration pressure (unlike GFR).
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