organellemembraner
Organelle membranes are lipid bilayers that enclose most eukaryotic organelles and, in the case of the cell, the plasma membrane. They establish distinct internal environments essential for metabolism and signaling. The membranes are dynamic and semi-permeable, regulating which substances enter or leave compartments.
Structure and composition: The core is a phospholipid bilayer with hydrophilic heads facing outward and hydrophobic
Major examples: Nuclear envelope consists of inner and outer membranes perforated by nuclear pores; Mitochondria have
Functions and dynamics: Membranes mediate selective transport via channels, transporters, pumps; generate electrochemical gradients; compartmentalize metabolic