Web Reference: Mar 2, 2026 · A cell membrane is a thin covering that surrounds every living cell. It functions as a barrier, keeping cell constituents in and unwanted substances out, and as a gate, allowing transport into the cell of essential nutrients and movement from the cell of waste products. Sep 9, 2025 · The cell membrane (or plasma membrane) is a selectively permeable barrier that encloses the cell. It consists mainly of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. Since mature mammalian red blood cells lack both nuclei and cytoplasmic organelles, the plasma membrane is the only lipid-containing structure in the cell. Consequently, all of the lipids extracted from the cells can be assumed to have resided in the cells' plasma membranes.
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