The removal of plasma water and some low–molecular weight particles by using a pressure or osmotic gradient is known as:
a. dialysis.
b. diffusion.
c. clearance.
d. ultrafiltration.
D
Ultrafiltration is the removal of plasma water and some low–molecular weight particles by using a pressure or osmotic gradient. Ultrafiltration is primarily aimed at controlling fluid volume, whereas dialysis is aimed at decreasing waste products and treating fluid and electrolyte imbalances. Diffusion (or clearance) is the movement of solutes such as urea from the patient's blood to the dialysate cleansing fluid, across a semipermeable membrane (the hemofilter).
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