What is the most common transport mechanism by which glucose and other organic solutes cross the luminal membrane of an epithelial cell layer?
A) secondary active cotransport with Na+
B) glucose ATPase pump
C) facilitated diffusion
D) simple diffusion through the paracellular pathway
E) through an ion channel

Question

Quizplus · Accepted Answer

Secondary active cotransport with Na+ is the most common transport mechanism by which glucose and other organic solutes cross the luminal membrane of an epithelial cell layer. This is because Na+ is maintained at a higher concentration outside the cell than inside, creating a gradient that can be used to drive the transport of glucose and other solutes against their concentration gradient. This process is also known as "symport," where the two molecules move in the same direction.

What Is the Most Common Transport Mechanism by Which Glucose