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Illustration of a eukaryotic cell membrane Comparison of a eukaryotic vs. a prokaryotic cell membrane. The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extracellular space).
The open conformation of the ion channel allows for the translocation of ions across the cell membrane, while the closed conformation does not. Voltage-gated ion channels are a class of transmembrane proteins that form ion channels that are activated by changes in a cell's electrical membrane potential near the channel. The membrane potential ...
Ion channels are also classified according to their subcellular localization. The plasma membrane accounts for around 2% of the total membrane in the cell, whereas intracellular organelles contain 98% of the cell's membrane. The major intracellular compartments are endoplasmic reticulum, Golgi apparatus, and mitochondria. On the basis of ...
Detailed diagram of lipid bilayer of cell membrane. The cell membrane, or plasma membrane, is a selectively permeable [citation needed] biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall.
If these receptors are ligand-gated ion channels, a resulting conformational change opens the ion channels, which leads to a flow of ions across the cell membrane. This, in turn, results in either a depolarization, for an excitatory receptor response, or a hyperpolarization, for an inhibitory response.
Cross-sectional view of the structures that can be formed by phospholipids in an aqueous solution. A biological membrane, biomembrane or cell membrane is a selectively permeable membrane that separates the interior of a cell from the external environment or creates intracellular compartments by serving as a boundary between one part of the cell and another.
Components of a typical plant cell: a. Plasmodesmata b. Plasma membrane c. Cell wall 1. Chloroplast d. Thylakoid membrane e. Starch grain 2. Vacuole f. Vacuole g. Tonoplast h. Mitochondrion i. Peroxisome j. Cytoplasm k. Small membranous vesicles l. Rough endoplasmic reticulum 3. Nucleus m. Nuclear pore n. Nuclear envelope o. Nucleolus p ...
This image is a derivative work of the following images: Image:Cell_membrane_detailed_diagram_3.svg licensed with Cc-by-sa-3.0 . 2008-06-13T14:41:45Z Dhatfield 1973x1532 (498192 Bytes) {{Information |Description=The cell membrane, also called the plasma membrane or plasmalemma, is a semipermeable lipid bilayer common to all living cells.