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5 most important parts of the muscular system

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skeletal muscles
voluntary muscles attached to bones and provide the force needed to move bones
smooth muscles
located in the walls of internal organs such as the digestive tract, blood vessels, and ducts leading from glands
actin
one of the proteins into which actomyosin can be split
irritability
a disposition to exhibit uncontrolled anger
brain and spinal cord
central nervous system

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