Just like a locomotive engine, muscles can only:

pull

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push

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flex

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relax

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Solution

The correct option is A
pull

Muscles can only pull; they cannot push. All the movements of the limbs and some other parts of the body are done by the pulling action of muscles. Muscles work in pairs to cause a back and forth motion of the limbs. For example - biceps and triceps work in a pair to pull the arm towards and away from the body.

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A muscle can only pull.

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