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___ carries carbon dioxide away from the cells

the circularitory system consists of :

carbon dioxide moves ___ alvioli

the oxygen moves from the alveoli into the

It is easy for the gases to move because the alveoli ___

___ is the addictive substance in cigrattes

You get lung damage because ___

when you have a heart attack ___ causes it

when you exercise your muscles need more energy from the circulatitory system

when you exerise you breath faster, you breath in more carbon dioxide