Importance of the cytoskeleton Flashcards
What is the cytoskeleton
complex network of protein fibres that extends through the cytoplasm of the cell
what is the cytoskeleton mad eof
-microfilaments
-intermediate fibres
-microtubules
what are microfilaments made of
actin
whta type of fibres are microfilaments
they are contractile fibres
which out of the three components has the smallest diameter
microfilaments
which component has the largest diameter
microtubules
whats the role of microfilaments
bring about cell contraction during cytokinesis allowing the membrane to split in half
-involved in cell movement
what is the role of intermediate fibres
they give mechanical strength to cell
what are microtubules made of
tubulin
what is the role of microtubules
-involved in the moveement of organelles like vesicles within the cell,ATP is used to drive movement
-they form spindle fibres,which are involved in the segregation of chromosomes during cell division
-helps determine the shape of the cell
state all the roles of the cytoskeleton
-holds organelles like mitochondria in their position
-enables cell movement via the cilia and flahgells
-provides support to the cell
-helps maintain the shape of the cell
-the cytoskeleton provides a pathway for the movement of organelles like vesicles,within the cell
Why are microfilaments and microtubules involved in the movement of the cell and intermediate fibres are not
-microtubules made of tubulin
-microfilaments made of actrin
-actin contracts whereas tubulin polymerises, which leads to a change in the length of filaments
-change in the length of filaments results in cell movement
-intermediate fibres have fixed lengths for stability so not involved in moement
give an example of how the cytoskeleton is responsible for the movement of materials within the cell
When chromosomes separate during cell division, their movement depends on the contraction of microtubules in the spindle fibres.
