Diffusion equilibrium in dialysis fluid

Steps:

• Blood has high waste concentration; dialysis fluid starts at zero.
• Waste molecules diffuse across membrane from blood to fluid.
• Fluid concentration rises as molecules enter.
• Process continues until concentrations equalize, forming a plateau.

Why B is correct:

• B shows concentration increasing over time to a steady level, matching Fick's law where net diffusion stops at equilibrium.

Why the others are wrong:

• A: Depicts decreasing concentration, opposite of waste accumulation in fluid.
• C: Shows constant concentration, ignoring diffusion-driven change.
• D: Illustrates erratic fluctuations, not the smooth equilibration process.

Final answer: B