Water-soluble molecules such as glucose and amino acids move across the blood-brain barrier by ________.
A) diffusion
B) endocytosis
C) exocytosis
D) mediated transport
E) filtration

Question

Quizplus · Accepted Answer

Water-soluble molecules such as glucose and amino acids cannot easily cross the lipid bilayer of cell membranes due to their polar nature. They require specific transport proteins to facilitate their movement across membranes, including the blood-brain barrier. This process is known as mediated transport, which includes facilitated diffusion and active transport mechanisms, allowing these molecules to move efficiently into the brain.

Water-Soluble Molecules Such as Glucose and Amino Acids Move Across