Cell Biology
Membrane
A thin, flexible barrier that surrounds cells and organelles, controlling what enters and exits. Composed primarily of a phospholipid bilayer with embedded proteins.
Biological Context
Membranes are selectively permeable—they allow some molecules through while blocking others. This creates distinct internal environments essential for cellular function. Membrane proteins serve as channels, pumps, receptors, and enzymes.
Business Application
Organizational membranes: boundaries that separate inside from outside, controlling information, resource, and personnel flow. Effective membranes are selectively permeable—blocking threats while admitting opportunities. Too rigid means isolation; too porous means loss of identity.