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25.Centriolesa.- Centrioles function in what?26.Cytoskeleton a.- The cytoskeleton is what?i.Flexible lattice of fibrous proteins, called filaments, that give the cell structure andsupport. Not rigid or fixed, and can aid in intracellular transport of materials, suspension of organelles, formation of adhesions with other cells, contraction, and movement of certain cellsb.- What are microfilaments, microvilli, intermediate filaments, and microtubules (specifically cilia and flagella)?i.Microfilaments have the smallest diameter. One called actin, has man functions, such as muscle contraction, amoeboid-like movement of cells, and separation of cytoplasm during cell divisionii.Microvilli, are found in epithelial cells that are specialized for the exchange of moleculesiii.Intermediate filaments - a diameter of 10nm between those of microfilaments andmicrotubules; tend to be stronger and more stable tan microfilaments. Some called keratin, are found in skin and hair cells. Myosin is also found in muscle cells, working with actin to produce contractioniv.Microtubules (25nm) largest diameter, consists of long hollow tubes. Form spindle fibers, cilia, and flagella27.Cell-to-Cell Adhesions, 2.3page 39a.- Cell adhesions are made up of what kind of molecule?28.Tight Junctions29.Desmosomesa.- Desmosomes are found in what kind of tissue?
i.Found in tissues subject to mechanical stress, such as the heart, uterus, and skin. A desmosome is a filamentous junction between two adjacent cells that provides strength so that the cells do not tear apart when the tissue is subjected to stress.ii.Each desmosome contains a plaque formed by glycoproteins clustered inside each cell. Cadherins extend from this plaque, which are protein filaments that cross the plasma membrane into the EC space. The cadherins are linked to intracellular filaments at the plaqueb.- What is the plaque and cadherins?