The primary muscles used during inspiration are the
A) diaphragm and external intercostal
B) diaphragm and internal intercostal
C) external and internal intercostal
D) external intercostal and rectus abdominis
E) diaphragm and rectus abdominis

Question

Quizplus · Accepted Answer

The diaphragm and external intercostal muscles are the primary muscles used during inspiration. The diaphragm contracts and moves downward, which helps to increase the volume of the thoracic cavity. At the same time, the external intercostal muscles contract, pulling the ribcage upward and outward to further increase the volume of the chest cavity. This increase in volume leads to a decrease in pressure, which allows air to rush into the lungs.

The Primary Muscles Used During Inspiration Are the