40. Circulatory System
Gas Exchange
Multiple Choice
Multiple ChoiceWhen you exhale, __________.
A
both the diaphragm and rib muscles contract
B
the rib muscles contract and the air pressure in the alveoli becomes lower than atmospheric pressure
C
the volume of the chest cavity increases
D
the diaphragm relaxes and the lungs expand
E
both the diaphragm and the rib muscles relax
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