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Question

Go through the following diagram describing muscle contraction.


Now identify A to E:

A
A-Cross bridge, B-Cross bridge formation, C-Breaking of cross-bridge, D-Sliding/ (rotation), E-ATP
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B
A-Cross bridge, B-Cross bridge formation, C-Sliding/(rotation), D-Breaking of cross-bridge, E-ATP
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C
A-Cross bridge, B- Breaking of cross-bridge, C-Sliding/(rotation), D- Cross bridge formation, E-AMP
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D
A-Cross bridge, B- Cross bridge formation, C- Sliding/(rotation), D-ADP, E- Breaking of cross-bridges
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Solution

The correct option is B A-Cross bridge, B-Cross bridge formation, C-Sliding/(rotation), D-Breaking of cross-bridge, E-ATP
Muscle contraction is initiate by a signal sent by central nervous system via motor neuron. Muscle contraction occurs when the thin actin and thick myosin filaments slide past each other. It is generally assumed that this process is driven by cross-bridges which extend from the myosin filaments and cyclically interact with the actin filaments as ATP is hydrolysed.



In the given diagram:
A= Cross bridge
B= Formation of cross bridge
C= Sliding/rotation
D= Breaking of cross bridge
E= ATP

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