Osmosis allows for the removal of fluid from the blood by allowing it to pass through the semipermeable membrane to an area of high concentrate (dialysate), and diffusion allows for passage of particles (electrolytes, urea, and creatinine) from an area of higher concentration to an area of lower concentration.Option B: Fluid passes to an area with a higher solute concentration. Option C: The pores of a semipermeable membrane are small, thus preventing the flow of blood cells and protein molecules through it.