The glucose concentration is higher in the cytosol of an intestinal epithelial cell (IEC) than it is in the intestinal lumen and in the basal extracellular fluid. Thus, to prevent glucose from leaving the IEC and going into the intestine lumen and to allow glucose to enter into the blood: a. IEC symporters are found only in the plasma membrane (PM) facing the intestine lumen. b. IEC Na+/glucose symporters are found only in the plasma membrane (PM) facing the basal extracellular fluid c. IEC glucose uniporters are found only in the PM facing the basal extracellular fluid. d. IEC glucose uniporters are found only in the PM facing the intestine lumen. e. Both a and c are correct answers.