Question

multiple cholce question
describe air pressures at the end of expiration (the pause between breaths).
o air pressure outside the lungs is higher than pressures inside the lungs.
o air pressures inside and outside of the lungs are equal.
o air pressure outside the lungs is lower than pressures inside the lungs.

Explanation:

During the pause between breaths (end of expiration), there is no air flow. According to the principle of air movement (air moves from high - pressure to low - pressure areas), when there is no net movement of air, the pressure inside and outside the lungs must be equal.

Answer:

Air pressures inside and outside of the lungs are equal.