The first event in inspiration is
A)the diaphragm moves downward and the external intercostal muscles contract.
B)atmospheric pressure forces air into the respiratory tract.
C)decreased intra-alveolar pressure.
D)lung inflation.

Question

Quizplus · Accepted Answer

The first event in inspiration is the contraction of the diaphragm, which moves downward, and the external intercostal muscles, which contract to lift the rib cage and expand the thoracic cavity. This increases the volume of the pleural cavity and decreases the pressure within it, leading to air entering the lungs.

The First Event in Inspiration Is