Explain why the cytoplasmic membrane acts as a barrier that ensures the selective

Explain why the cytoplasmic membrane acts as a barrier that ensures the selective penetration of substances from the external and internal environment.

The plasma membrane, or plasmalemma, occupies a special place among the various cell membranes. This is a superficial peripheral structure that limits the cell from the outside, which determines its direct connection with the extracellular environment, and therefore with all substances and stimuli affecting the cell. Therefore, the plasma membrane plays the role of a barrier, a barrier between complex intracellular contents and the external environment.