what substances pass easily through the pores of dialysis tubing ?

Question

anonymous · Answer

all the nitrogenous waste products can pass. The dialysis fluid is kept at a concentration that is like that of the blood. So only the waste products are filtered out and if sometimes, the blood lacks some important nutrients so they are added to the fluid as well so they can diffuse into the blood.

anonymous · Answer

Physicsme gave the right answer; to elaborate:  dialysis cartridges are designed to artificially perform the same function as the nephrons of the kidneys.  The goal is to eliminate toxins from the blood while keeping cells and nutrients.