18.
Air breathed out has more carbon dioxide than air breathed in because
______________________________.
19.
The total capacity of the lungs is about ___________________ cc.
20.
Vital capacity of the lungs (usually about 4,800 cc) is ______________________
________________________________________________________________
21.
The inner surfaces of the alveoli must be kept wet to __________________
______________________.
22.
The chief muscle of respiration is the ______________________________.
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MD0568
1-21