BIO 201 Lecture Notes - Lecture 11: Cell Adhesion, Cell Adhesion Molecule, Multicellular Organism
6 Sep 2018
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Lecture 11: multicellularity: extracellular matrix and cell adhesion (ch. Cellular structures associated with multicellularity: cell adhesions, plant cell walls, extracellular matrix. Cell adhesions (the ways cells stick together to create a protection boundary) Several different types of adhesions serve slightly different purposes. Adhesions made of cell adhesion molecules (cams) Epithelial cells protein in the cytoplasm in the membrane. Specialized, polarized cells that form a boundary between organism (e. g. bloodstream) and outside world (e. g. lumen) Held together by tight junctions nearly impenetrable barrier food is in the lumen. Cross-sectional view of epithelium tight junction proteins (green) Extracellular proteins and polysaccharides are generally constitutively secreted by the cell(s) that they surround. Comprised of cellulose and other polysaccharides and various proteins. Anchors cells and holds them together because its sticky. Most abundant proteins in mammals (25-35% of protein) Large, polar surface area attracted h2o and other molecules cushioning. Signaling: promotes cell migration, signal for growth and differentiation.
