Which of the following correctly describes the process of inspiration (air entering the lungs)?
A)The lungs contract, causing their internal pressure to decrease.
B)The lungs expand, causing their internal pressure to decrease.
C)There is no change in the internal pressure in the lungs.
D)The lungs contract, causing their internal pressure to increase.
E)The lungs expand, causing their internal pressure to increase.

Question

Quizplus · Accepted Answer

During inspiration, the diaphragm and external intercostal muscles contract, causing the thoracic cavity to expand. This increase in volume decreases the pressure in the lungs, allowing air to flow in from the environment through the airways, down the pressure gradient. Therefore, the correct choice is B, as the lungs expand, causing their internal pressure to decrease.

Which of the Following Correctly Describes the Process of Inspiration