Microtubules
Definition: >>-Non branching & rigid hollow fine tubes >>-Formed of tubulin protein. L.M: Not seen, Needs special stains
E.M: -Fine tubules: >>-Diameter: 20-25nm >>-Length: Changed by adding or removal of tubulin molecules at their end
Forms of microtubules: >>1-Dynamic: Continuous assembly & disassembly → Rapid reshaping of the cell >>2-Stable: Solid microtubules forming the wall of centrioles & flagella
Functions: >>1. Maintain cell shape e.g. platelets >>2. Elongation & movement of the cell 3. Intracellular vesicular transport >>4. Formation of mitotic spindle during cell division 5. Formation of centrioles, cilia & flagella
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