BIOB33H3 Lecture Notes - Lecture 2: Basal Lamina, Cell Adhesion Molecule, Intermediate Filament
14 Nov 2013
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Document Summary
Plasmalemma: the outer boundary of a cell, also known as the cell membrane or plasma membrane. This is composed of proteins, phospholipids, and cholesterol in different amounts depending on the type of cell. Transport of water-soluble molecules and ions are not possible since these will not associate with the hydrophobic phospholipid tails, meaning the separation of intra and extracellular fluid is maintained well. The carbohydrate parts extend outside of the cell to form a coating called the glycocalyx which can act as receptors. Functions of this layer include isolation, transp0ort/exchange, sensitivity to changes in the ecf and communication and reception, and structural support. Microvilli: small finger-like projections of the cell membrane, found in cells involved with absorbing materials. These increase the surface area exposed for maximal absorption, strengthened by microfilaments, which can produce a waving/bending action to circulate materials to be absorbed. Intercellular attachments: there are different ways cells can hold themselves together to form tissues.
