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Myosin Molecule

Formation of ...

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Formation of cross bridges by actin and myosin is seen in :-

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What is the correct sequence of events in the cross bridge formation?

i. The power stroke

ii. Cross bridge formation

iii. Myosin head is activated by ATP

iv. Calcium released binds to the troponin unblocks the actin sites

v. Cross bridge detachment

vi. Reactivation of the myosin head

What is the correct sequence of events in the cross bridge formation?

i. The power stroke

ii. Cross bridge formation

iii. Myosin head is activated by ATP

iv. Calcium released binds to the troponin unblocks the actin sites

v. Cross bridge detachment

vi. Reactivation of the myosin head

Q. Arrange the order of events in the cross-bridge cycle:
(i) The myosin head pulls the actin filament towards the M-line.
(ii) The myosin head releases ADP and phosphate.
(iii) The myosin head hydrolyses ATP.
(iv) The myosin head binds actin.

Q. Describe the structure of actin and myosin filaments.

(The Length Sarcomere is

2.5 μ m (

= 1 μ m,)

= 1.5 μ m

1

Myosin filament &

1

Actin filament is surrounded by

3

Myosin filament.)

Q. State whether the following statements are true or false.
Cross bridges pull the actin chain as the myosin heads return to their unenergized conformation.

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