CELL ORGANELLES: microtubules

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ALL CELLS / Animal Cell : nucleus / nucleolus / nuclear envelope / nuclear pore / centrioles / cell membrane / microtubule / smooth endoplasmic reticulum / rough endoplasmic reticulum / ribosomes / polysomes / lysosome / peroxisome / mitochondrion / Golgi /

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ORGANELLE DIAGRAM: MICROTUBULES: In this picture, microtubules are the pale spoke-like structures. They originate near the centre of the cell at the centrosome. The centrosome contains two centrioles, which are bundles of microtubules. Microtubules are protein polymers which are relatively rigid and afford the cell some strength. Microtubules also act in a funicular-like way to help objects move around in the cell.

SUMMARY

• name(s): microtubule
• location: throughout cell radiating from centromere
• appearance: slender, individual, spoke-like.
• size: about 25nm in diameter
• function: cell support, movement of cell structures (including the pulling apart of daughter chromosomes in cell division).

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