Which of the following is necessary for the lungs to remain expanded?
A)The alveolar cells must secrete surfactant.
B)The intrapulmonic pressure must be negative.
C)The glottis must be closed.
D)The intrapleural pressure must be negative.

Question

Quizplus · Accepted Answer

The intrapleural pressure must be negative to keep the lungs expanded. When the intrapleural pressure is negative, the chest wall pulls outward while the lungs try to collapse, resulting in lung expansion.

Which of the Following Is Necessary for the Lungs to Remain