Lecture 1.2 Anatomy
Terms
undefined, object
copy deck
- 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