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Cell Membranes play very vital roles in the physiology of the cells. They insulate the cells interior from the interior by separating it from it's environment.

It is highly selective and pass only the molecule that is required by the cell and the correct time.

It also filters the environmental signals that are passed into the cells, by the receptors that are present on it.

They are in some cases, like that of few bacteria, site of important physiological activities like respiration.

They also control the thermal insulation though their fatty acid constituents.

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