Cell Shape and Mobility the Cytoskeleton
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Transcript of Cell Shape and Mobility the Cytoskeleton
Cell Shape and Mobility the Cytoskeleton
Cytoskeleton• Defines cell’s shape
• Facilitates shape changes
• Enables cell movement
• Directs organelle movement
The Three Main Subunits
Microtubules
• Structure– Protein subunits
• Function– Maintains cell shape– Moves chromosomes during cell division– Moves cells about– flagella and cilia
Microtubules – maintain cell shape
Microtubules – moving chromosomes
Microtubules – moving cells with flagella and cilia
Microfilaments
• Composition– Actin – protein double strand
• Function– Maintain Shape– Motion - pseudopodia / cytoplasmic streaming– Contraction – cleavage furrow / muscle
Microfilaments – maintain shape
Microfilaments - motion– Motion - pseudopodia / cytoplasmic streaming
Microfilaments - contraction
Cytokinesis muscle contraction
Intermediate Filaments
• Composition– Keratins – a family of proteins
• Function– Reinforce cell shape