4.05 : Muscular Systems

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Which statement is correct about the flatworm's muscular system?

it consists of two layers of muscle

When a person bends an arm, a different muscle is being used to bring it back to the original position. Why can't the same muscle be used to both bend and unbend the arm?

muscles can only pull, not push

Which statement is correct about the human muscular system?

smooth and cardiac muscles operate involuntarily


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