1.3 How do cells move? Flashcards

1
Q

Cilia and Flagella

A
  • Microtubles control the beating of cillia and flagella, locomotor appendages of some cells
  • Cillia and flagella differ in their beating patterns
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2
Q

Motion of flagella

A

—————————————->

Direction of swimming

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3
Q

Motion of Cillia

A

—————————————–>
Direction of movement

Recovery stroke

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4
Q

Dynein ‘walking’ moves flagella + cillia

A
  • Dynein arms alternatively grab, move, and release the outer microtubules
  • Protein cross-links limit sliding
  • Forces exerted by dynein arms cause doublets to curve, bending the cillium or flagellum

effects of unrestrained dynein movement:

microtubules contain the dynein protein which cross-links proteins between outer doublets

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5
Q

Actin/myosin ‘walking’/motors facilitate muscle cell contractions

A

Muscle cell

  1. actin filament
  2. myosin filament
  3. myosin head
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6
Q

Amoeboid movement

A
  1. cortex (outer cytoplasm): gel with actin network
  2. Inner cytoplasm: sol with actin ubunits
  3. extending pseudopodium
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