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8 terms

erin hall chapter 19 human body

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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