Each lung is filled with million of alveoli, small air sacs that control the exchange of gases (breathing in oxygen and eliminating carbon dioxide).
(Each lung; is filled; with million of alveoli) (small air sacs; control; the exchange of gases (breathing in oxygen and eliminating carbon dioxide) (the exchange of gases; breathing; L:in oxygen)
Each lung small air sacs the exchange of gases
is filled control breathing
with million of alveoli
the exchange of gases (breathing in oxygen and eliminating carbon dioxide
L:in oxygen