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
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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