1. Cytoskeleton The cytoskeleton is a network of protein filaments found throughout the cytosol that provides a structural framework for the cell. It also maintains the shape and function of other organelles, and aids movement of material through the cytosol.
4 types of filaments make up the cytoskeleton
i)
Microfilaments :
Composed of protein Actin
Thinnest fibres
Found at edge of the cell
Generate movement and provide mechanical support defining the basis strength and shape of the cell. Aid in movement such as muscle contraction, cell division, and cell locomotion (migration of embryonic cells during development)
ii)
Intermediate Filaments : Medium sized
Found throughout the cell at stress points Function: to withstand mechanical stress
iii)
Thick Filaments :
Composed of Myosin
Larger than Intermediate but smaller than Microtubules Myosin is only found in muscle cells
iv)
Microtubules : Largest Found in the middle of the cell and radiate out from Centrosome Maintain cell shape Facilitative movement of cell organelles
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