Centrioles

The formula of centrioles is (9×3) +0. It means 9 pares of microtubules in the periphery and 0 in the center.

Each rod-shaped centriole is about 0,2 nm long and consists of nine triplets of microtubules that are oriented parallel to long axis of the organelle. The three microtubules are fused to one another, with adjacent microtubules sharing a common wall. Centrioles and adjacent dense material (centriolar satellites) constitute a general microtubule organizing center in both interphase and mitosis.

Functions of microtubules:

1. Cell elongation and movement

2. Intracellular transport of secretory granules

3. Movement of chromosomes during mitosis and meiosis

4. Maintenance of cell shape

5. Beating of cilia and flagella

Microtubules are elongated polymeric structures made up of equal parts of α tubulin and β tubulin.

Дата добавления: 2015-07-25