Marrisa P.

asked • 01/30/17

How does air pressure control expiration?

How does air pressure control expiration? 
Select one:
a. A decrease in air pressure within the lungs allows air to flow in.
b. An increase in air pressure within the lungs allows air to flow out.
c. A decrease in air pressure within the lungs causes them to contract.
d. An increase in air pressure within the lungs causes them to expand.

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