The inspiratory muscles include the
A)diaphragm and internal intercostal muscles
B)diaphragm and external intercostal muscles
C)diaphragm and abdominal muscles
D)internal and external intercostal muscles
E)intercostal and abdominal muscles

Question

Quizplus · Accepted Answer

The inspiratory muscles are responsible for expanding the thoracic cavity and increasing the volume of the lungs during inspiration. The diaphragm is the primary inspiratory muscle, and it contracts to move downward and increase the vertical dimensions of the thorax. The external intercostal muscles, located between the ribs, also contract to elevate the ribcage and increase the lateral dimensions of the thorax. Therefore, choice B (diaphragm and external intercostal muscles) is the best answer.

The Inspiratory Muscles Include the