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
2
Q
Motion of flagella
A
—————————————->
Direction of swimming
3
Q
Motion of Cillia
A
—————————————–>
Direction of movement
Recovery stroke
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
5
Q
Actin/myosin ‘walking’/motors facilitate muscle cell contractions
A
Muscle cell
- actin filament
- myosin filament
- myosin head
6
Q
Amoeboid movement
A
- cortex (outer cytoplasm): gel with actin network
- Inner cytoplasm: sol with actin ubunits
- extending pseudopodium