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17 Cards in this Set
- Front
- Back
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Plasma Membrane
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defines the boundary of the cell. Governs its interaction with other cells. Maintains chemical composition differences between ECF and ICF. Controls passage of materials in and out.
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cytoplasm
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Everything
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Cystol (ICF)
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Clear liquid
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Inclusions
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packets of waste material
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cytoskeleton
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Framework for structure and trafficing
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nucleus
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contains DNA
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extracellular fluid
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fluid outside the plasma membrane
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Structures and functions of the Plasma Membrane
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1. Bilayered membrane
2. Defines boundary of cell 3. Governs cell - cell communication 4. maintains internal environment |
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Plasma membrane lipids
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Phospholipids = 75%
Cholesterol = 20% (maintains elasticity of each cell Glycolipids = 5% (cell identification marker) |
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amphiphatic molecule
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both hydrophillic and hydrophobic
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Cholesterol
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makes molecules flexible
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Too much cholesterol
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impairs function and inhibits action of enzymes and receptor proteins
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Too little cholesterol
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Plasma membranes become fragile (stroke due to ruptered BV's)
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Glycolipids
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Phospholipids with short carbon chain. Only occurs on the Extracellular face
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Glycocalyx
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coating
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Peripheral proteins
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-Loosely attached usually to inner surface
-Anchors integral protein to cytoskeleton |
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Integral (transmembrane) proteins
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-Passes through plasma membrane
-Hydrophilic and Hyrophobic regions -Sugar modifications used as a fingerprint |
