Cell membrane: Difference between revisions
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==Definition== | ==Definition== | ||
The '''cell membrane''' (also called the '''plasma membrane''') is a thin membrane completely surrounding the [[cell]]. It comprises a [[lipid bilayer]]. It controls the entry and exit of materials relative to the cell, and also the interaction and signals between the cell and its environment. | The '''cell membrane''' (also called the '''plasma membrane''', '''cytoplasmic membrane''', or '''plasmalemma''', and abbreviated as '''PM''') is a thin membrane completely surrounding the [[cell]]. It comprises a [[lipid bilayer]]. It controls the entry and exit of materials relative to the cell, and also the interaction and signals between the cell and its environment. | ||
==Summary== | |||
{| class="sortable" border="1" | |||
! Item !! Value | |||
|- | |||
| Type of organisms whose cells contain cell membranes || All organisms; see [[all cells have cell membranes]] | |||
|- | |||
| Type of cells within the organisms that contain cell membranes || All cells; see [[all cells have cell membranes]] | |||
|- | |||
| Number of cell membranes per cell || 1; there's just one cell membrane enclosing the cell | |||
|- | |||
| Shape || The shape is the same as the shape of the cell. | |||
|- | |||
| Size || The cell membrane is about 5-10 nm (50-100 angstrom) thick. This is typical for lipid bilayers. | |||
|- | |||
| Location within cell || The cell membrane is the boundary of the cell, enclosing it from all sides. | |||
|- | |||
| Chemical constituents || Lipids, phospholipids, carbohydrates, proteins | |||
|- | |||
| Function || Control of the entry and exit of materials as well as signals from the environment to the cell | |||
|} | |||
Latest revision as of 20:52, 8 May 2022
Definition
The cell membrane (also called the plasma membrane, cytoplasmic membrane, or plasmalemma, and abbreviated as PM) is a thin membrane completely surrounding the cell. It comprises a lipid bilayer. It controls the entry and exit of materials relative to the cell, and also the interaction and signals between the cell and its environment.
Summary
| Item | Value |
|---|---|
| Type of organisms whose cells contain cell membranes | All organisms; see all cells have cell membranes |
| Type of cells within the organisms that contain cell membranes | All cells; see all cells have cell membranes |
| Number of cell membranes per cell | 1; there's just one cell membrane enclosing the cell |
| Shape | The shape is the same as the shape of the cell. |
| Size | The cell membrane is about 5-10 nm (50-100 angstrom) thick. This is typical for lipid bilayers. |
| Location within cell | The cell membrane is the boundary of the cell, enclosing it from all sides. |
| Chemical constituents | Lipids, phospholipids, carbohydrates, proteins |
| Function | Control of the entry and exit of materials as well as signals from the environment to the cell |