BIOL 102 Lecture Notes - Lecture 12: Cytoskeleton, Chitin, Basal Body
Document Summary
All cell movement is tied to the movement of actin filaments, microtubules, or both. Intermediate filaments act as intracellular tendons, preventing excessive stretching of cells. Actin filaments play a major role in determining the shape of cells. Essential processes as inflammation, clotting, wound healing, and the spread of cancer. Crawl out to venules and into tissue to destroy potential pathogens. Actin filaments rapidly polymerize and their extension forces the edge of the cell forward. Extended region stabilized when microtubules polymerize into the newly formed region. Myosin: responsible for the forward movement of the cell is then achieved through the action of this protein. Receptors on the ell surface can detect molecules outside the cell and stimulate extension in specific directions, can move towards specific targets. Eukaryotic and prokaryotic cells have different kinds of flagella. Eukaryotic cells: consisting of a circle of nine microtubule pairs surrounding two central microtubules (9+2 structure)
