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skeletal system

made of all the bones in your body


pigment that gives your skin color


an organ taht can relax, contract, and provide force to move you and your body parts


the substances in food that provide for cell development, growth, and repair

respiratory system

system made of structures and organs that help move oxygen into the body and waste gases out of the body


grapelike clusters of air sacs at the end of each bronchioles


microscopic blood vessels that surround each alveolus


an involuntary, automatic response to a simulus

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