What is the role of tight junctions in the transport of glucose across the intestinal epithelium?
A) They open and allow glucose to pass between the epithelial cells.
B) They keep the Na+-K+ pumps in the apical membrane only.
C) They keep the Na+-glucose cotransporter in the apical membrane and the glucose-facilitated transporter in the basolateral membrane.
D) They keep the glucose-facilitated transporter in the apical membrane and the Na+-glucose cotransporter in the basolateral membrane.
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