Biomembrane

Biomembranes serve as a separation layer (membranes) between different areas within a living cell or between the interior of a cell and the cell exterior (in the case of the cell membrane). Within the cell, biomembranes separate the interior of organelles or vacuoles from the cytoplasm. However, a biomembrane is not only a passive separation layer, but also plays an active role in the transport of molecules and information from one side to the other. https://de.wikipedia.org/wiki/Biomembran