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Voluntary muscle movements are the result of conscious effort by the brain. Involuntary muscles such as the heart or smooth muscles in the gut and vascular system contract as a result of non-conscious brain activity or stimuli proceeding in the body to the muscle itself.

Your answer: The heart and smooth muscles in the gut and vascular system (lungs) are muscles that work "without thinking about it" -- we call these "involuntary" muscles.

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