If Mary is running and race and begins to breathe hard, what happens to the air pressure in her lungs as she expands her chest?
increases decreases
A B
Exhaling, or breathing out, decreases the size of the chest, which increases air pressure inside the lungs.
air pressure inside the lungs
decreases
increases
LESS
MORE
size of the chest
increases
decreases
air pressure in her lungs
air pressure in her lungs
air pressure in her lungs