During inspiration
A) the diaphragm contracts and moves up into the thoracic cavity
B) the chest cavity expands
C) the pressure in the thoracic cavity increases
D) all of the above

Question

Quizplus · Accepted Answer

During inspiration, the diaphragm contracts and moves downward (not upward), increasing the volume of the thoracic cavity, which causes the chest cavity to expand. This expansion leads to a decrease (not increase) in pressure within the thoracic cavity, facilitating the inflow of air into the lungs.

During Inspiration