The specialized function shared by the cells that line the lungs and those that line the lumen of the gut is that both types of cells
A) receive their oxygen directly from inhaled air and ingested foods.
B) provide abundant exchange surface.
C) have exceptionally high numbers of cellular organelles in the cytoplasm.
D) offer greater protection due to increased membrane thickness.
E) have a lowered basal metabolic rate due to cooperative exchange between cells.
Answer: B