erin hall chapter 19 human body

8 terms by eghall 

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skeletal system

made of all the bones in your body

melanin

pigment that gives your skin color

muscle

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

nutrients

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

alveoli

grapelike clusters of air sacs at the end of each bronchioles

capillaries

microscopic blood vessels that surround each alveolus

reflex

an involuntary, automatic response to a simulus

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