Cytoskeleton, cell motility

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8 Terms

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Components of cytoskeleton

Actin

tubulin

protofilament

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Functions of cytoskeleton

Structure and support

Intracellular transport

Contractility and mobility

Spatial organization

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Skeletal muscles

a-actin

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Cardiac muscles

b-actin

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Smooth muscles

a & b actin

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non-muscle tissues

y-actin

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Mechanisms of sliding filament theory

Myosin cross-bridge attaches to actin myofilament

Myosin head pivots and pulls on the actin filament (ADP +Pi released)

New ATP attached to myosin head, cross bridge detaches

ATP hydros used, erecting the myosin head

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Amoeboid migration

Most common mode of locomotion in eukaryotic cells

caused by the protrusion of cytoplasm of the cell involving the formation of pseuopodia