Hemodialysis is a procedure that patients who have limited or virtually non-exis

Question

Hemodialysis is a procedure that patients who have limited or virtually non-existent kidney function undergo to remove both waste products and extra fluid from their bloodstream. Blood from an artery of a hemodialysis patient is diverted into an artificial kidney where the blood enters numerous tiny fibers. An aqueous salt solution called dialysis fluid flows around these fibers. Waste products, most notably urea and excess fluid within the blood pass through the fibers and into the dialysis fluid. The purified blood returns to the bloodstream through a vein. Consider the schematic of an artificial kidney below. After a certain amount of time in dialysis treatment, the flow rates and concentrations are as follows. 640.0 mL/min Dialysis fluid 326.0 mL/min Blood 320.0 mL/min Blood to a ve from an artery 1.279 mg Urea/mL 1.420 mg Urea/ml Artificial Kidney Waste dialysis fluid Scroll down for more questions.

Explanation / Answer

Rate of urea removed from blood stream = 0.141 mg urea /min

Fluid is removed from blood= 360 mL fluid/hour

Concentration of urea in waste fluid =0.423mg/L

Fluid removed 2.5-3.5 L/hour

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