A prototype for a learning program that combines lectures with flash cards
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<h1 class="title">The Cell Membrane</h1>
<p class="key">bio.cell.membrane1</p>
<p class="links">
<a href="https://en.wikipedia.org/wiki/Cell_membrane">Wikipedia</a>
<a href="https://www.google.de/search?q=cell%20membrane">Google</a>
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The cell membrane (also known as the plasma membrane or
cytoplasmic membrane) is a biological membrane that separates
the interior of all cells from the outside environment.
The cell membrane is selectively permeable to ions and organic
molecules and controls the movement of substances in and out of
cells. The basic function of the cell membrane is to protect
the cell from its surroundings. It consists of the phospholipid
bilayer with embedded proteins. Cell membranes are involved in
a variety of cellular processes such as cell adhesion, ion
conductivity and cell signalling and serve as the attachment
surface for several extracellular structures, including the
cell wall, glycocalyx, and intracellular cytoskeleton. Cell
membranes can be artificially reassembled.
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<img src="https://upload.wikimedia.org/wikipedia/commons/d/da/Cell_membrane_detailed_diagram_en.svg" />
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The cell membrane (or plasma membrane or plasmalemma) surrounds
the cytoplasm of living cells, physically separating the
intracellular components from the extracellular environment.
Fungi, bacteria and plants also have a cell wall in addition,
which provides a mechanical support to the cell and precludes
the passage of larger molecules. The cell membrane also plays a
role in anchoring the cytoskeleton to provide shape to the
cell, and in attaching to the extracellular matrix and other
cells to help group cells together to form tissues.
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