Which part of the cell membrane acts as a barrier to hydrophilic molecules entering the cell?

Question

Quizplus · Accepted Answer

The hydrophobic tails of the phospholipid bilayer act as a barrier to hydrophilic molecules, as they repel water and other polar substances. This allows only small, nonpolar molecules (such as oxygen and carbon dioxide) to pass through the membrane freely. Larger or polar molecules require specific transport mechanisms, such as channels or transporters, to cross the membrane.

Which Part of the Cell Membrane Acts as a Barrier