Microtubules - longer Cilia and Flagella Axoneme structural...

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Two Basic Types of Cells Microtubules * straight hollow tubes composed of globular proteins called tubulins * provide anchorage of organelles and act as tracks along which organelles can move within the cytoplasm * guide the movement of chromosomes in cell division * the structural basis for flagella and cilia Cilia and Flagella Both consist of microtubules surrounded by cytosol and enclosed by plasma membrane * Cilia- short numerous appendages used for locomotion and the movement of substances along the surface of the cell * Flagella- longer, generally less numerous appendages used for locomotion (sperm) Cilia and Flagella * These motile appendages are constructed by basal bodies (kinetostomes), which also function as centrioles. * The basal body is located at the base of each filament, anchoring it to the cell and controlling its movement. * Cilia and flagella have the same structure. The only difference is that the flagella are
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Unformatted text preview: longer. Cilia and Flagella * Axoneme- structural basis for ciliary movement * Consist of an array of thin protien cylinders called microtubles * There are two centrally microtubules surrounded by a ring of nine microtubule pairs (9+2 structure) * Dynein arms-a motor protein who’s movement causes cilia to bend Cilia In The Lungs * Sweeps dust and germ laden mucous from the lung passageways to the throat to be swallowed. * Cigarette smoke slows down and then stops the action of cilia . Centrosome and Centrioles * Centrosome- a dense area of cytoplasm near the nucleus that is involved in mitosis * Centrioles- a pair of structures composed of microtubules arranged in right angles that are located in the centrosomes. * Has an unknown function in mitosis * involved in the formation of flagella and cilia...
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