State the condition of muscle contraction in following diagram.

Resting potential

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Contraction

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Maximally contracted

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None of these

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Solution

The correct option is C Maximally contracted
Muscle contraction is initiate by a signal sent by central nervous system via motor neuron. During contraction of muscles $^{'} Z^{'}$ lines attached to these actins are pulled inwards thereby causing a shortening of sarcomere. The figure depicts the shortening of sarcomere to its limit, thus it is maximally contracted.

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