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- A) Consider membrane filtration. What is concentration polarization and why does it occur? B) What are the important parameters that affect the diffusivity in/across membranes and what do The they mean physically? C) Consider the Krogh Cylinder model. What is the physical meaning of the critical radiusand why does it occur?In the diagram below, which situation is when the red blood cell is exposed to hypertonic solution? What is happening to the red blood cells in that situation? (a) (b) (c) O c: hemolysis O c; crenation a; hemolysis O a; crenationWhat is the order of elution of proteins on a gel-filtrationcolumn? Why is this so?