cell shape and mobility the cytoskeleton
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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