The muscle cells change their shape due to certain -

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The muscle cells change their shape due to certain -

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Genes

Enzymes

Proteins

All of the above

answer is A.

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Detailed Solution

When a nerve impulse reaches, the muscle fibres must move. When the muscle cells move by changing their shape, they shorten. Muscle cells have special proteins that change both their shape and their arrangement in the cell in response to nervous electrical impulses.

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