Which of the Following Occurs During Human Inhalation

Question

Which of the following occurs during human inhalation?
A) The diaphragm relaxes and the external intercostal muscles relax.
B) The diaphragm relaxes and the external intercostal muscles contract.
C) The diaphragm contracts and the external intercostal muscles relax.
D) The diaphragm contracts and the external intercostal muscles contract.

Accepted Answer

During inhalation, the diaphragm contracts and moves downward, and the external intercostal muscles contract to raise the rib cage, increasing the volume of the thoracic cavity and decreasing the pressure inside, drawing air into the lungs.