Question

What is incorrect about the steps in hemodialysis?

• A. Blood is taken in tubing of selectively-permeable membrane.
• B. Exchange of urea between tubing and tank filled with dialyzing fluid.
• C. The dialyzing fluid has a lower osmotic pressure than blood.
• D. The dialyzing unit is also known as artificial kidney.

Answer 1

The correct option is C The dialyzing fluid has a lower osmotic pressure than blood.

Blood is taken in tubing of selectively-permeable membrane, which is surrounded by a tank filled with dialyzing fluid. The dialyzing fluid has an osmotic pressure equal to blood. It has everything in equal concentrations as blood, except nitrogenous wastes. So, nitrogenous wastes are exchanged between the tubing and tank filled with the dialyzing fluid. The dialyzing unit is also known as artificial kidney.