During inspiration, why does air move into the lungs?
A) The pressure inside the lungs has decreased below atmospheric pressure.
B) The pressure inside the lungs has increased above atmospheric pressure.
C) The increased pressure in the lungs has opened up collapsed airways, so air can flow in.
D) The space (volume) within the lungs has decreased, allowing air flow into the lungs.

Question

Quizplus · Accepted Answer

During inspiration, the diaphragm and intercostal muscles contract, increasing the volume of the thoracic cavity. This increase in volume leads to a decrease in pressure inside the lungs compared to the atmospheric pressure outside, causing air to flow into the lungs.

During Inspiration, Why Does Air Move into the Lungs