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17 Cards in this Set

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