Animal And Plant Cells

Cell Membrane


This is the extremely thin outside layer of an animal cell and the second layer of a plant cell. In plant cells the membrane is so thin that it cannot be distinguished from the cell wall. The membrane is not a solid barrier. It allows some materials to pass through but keeps others out (semi-permeable). The membrane controls the entry of materials into and out of the cytoplasm. Think of the membrane as an extremely thin plastic bag with changeable sized holes.

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