Question

multiple choice question
decreasing the size of the thoracic cavity causes air to move______the lungs.
into
out of

Explanation:

When the size of the thoracic cavity decreases, the volume of the lungs also decreases. According to Boyle's law (at a constant temperature, the pressure of a gas is inversely proportional to its volume), when the volume of the lungs decreases, the pressure inside the lungs increases. Since air moves from an area of higher pressure to an area of lower pressure, and the pressure inside the lungs becomes higher than the atmospheric pressure, air moves out of the lungs.

Answer:

out of