During passive inspiration, muscular contraction of the diaphragm causes air to move into the lung. The mechanisms that drive air movement during passive inspiration are:
A) a decrease in intraalveolar pressure and lifting of the rib cage.
B) a decrease in the size of the thorax and alveolar expansion.
C) an increase in the size of the thorax and a decrease in intrapleural pressure.
D) an increase in atmospheric pressure and intrapleural pressure.

Question

Quizplus · Accepted Answer

During passive inspiration, the diaphragm contracts and moves downwards, causing an increase in the size of the thorax. This increase in size leads to a decrease in intrapleural pressure, which then causes the lungs to expand and air to move into the lungs. The lifting of the rib cage is not the primary mechanism for air movement during passive inspiration. Atmospheric pressure does not play a major role in driving air movement during passive inspiration.

During Passive Inspiration, Muscular Contraction of the Diaphragm Causes Air