The Plasma Membrane

The cell membrane controls the entry and exit of materials through cells. The main role of cell membranes is to: Separate the internal environment of a cell from the external environment, Act as a site for chemical interactions and energy conversions, and Detect and bind to substances and initiate biological processes. The cell membrane consists of two layers separated by a very small space of approximately 7-10 nanometers and is found in both animal and plant cells.
There are 3 chemicals found in cell membranes.
Lipids - which form the bi-layer.
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