How do large polar molecules,such as the protein hormones secreted by endocrine cells or bacteria ingested by white blood cells,leave or enter the cell?

Question

Quizplus · Accepted Answer

Large polar molecules, such as protein hormones or bacteria, cannot easily cross the hydrophobic lipid bilayer of cell membranes. They enter or leave cells through vesicular transport, a process that involves the encapsulation of these molecules in vesicles, which then fuse with the cell membrane to release or intake the molecules. This method does not rely on osmosis, passive transport, or carriers, but rather on the formation and movement of membrane-bound vesicles.

How Do Large Polar Molecules,such as the Protein Hormones Secreted