Biological Membranes

Biological membranes are separating layers in the bodies of living organisms. They differentiate functional units such as cells or their subunits (organelles such as mitochondria) from the surrounding structures. Substances succeeded actively (by energy-consuming transport mechanisms), with a carrier or passively (for example by filtration) into the cells. Biological membranes have a total thickness of 70-100 Å (1 Angström = 10-10 m = 10 billionths of a meter).