The correct answer is
A) A and D
B) B and C
C) C and D
D) A and B
Correct Answer: B
Solution :
In the given diagram, at B, hydrolysis of ATP occur, while C represents power stroke. A never impulse reaches the muscle fibre, releasing calcium ions. This reveals myosin binding sites in the actin my filament. The myosin heads use the energy gained from ATP hydrolysis to move towards the binding sites. As the myosin leads bind to the actin my filament they till, pulling the actin my filament past them. As the actin filament moves, the myosin heads detach and reattach to the next binding site along.
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