Assertion: epithelium's surface | /r/MadeOf | glucose transporters
Facets:
value: to export glucose
type: PURPOSE
Source sentences:
text: The apical and basal membranes have distinct protein compositions that mediate these different activities; the apical surface contains sodium/glucose symporters to import glucose against its concentration gradient, whereas the basolateral surface contains glucose transporters to export glucose down its concentration gradient (see Tutorial on Passive and Active Transport).