D. The capillary walls have openings that allow large proteins and small cells to pass through. The three liver lobules are described as liver acinus or classic lobules or portal lobule. The capillary walls of liver acinus allow the passages of small cells and proteins to pass through. Solution D. The capillary walls have openings that allow large proteins and small cells to pass through. The three liver lobules are described as liver acinus or classic lobules or portal lobule. The capillary walls of liver acinus allow the passages of small cells and proteins to pass through..