Which of the following muscles contract to start inspiration?
A)rectus abdominis
B)diaphragm
C)external intercostals
D)Both diaphragm and external intercostals

Question

Quizplus · Accepted Answer

The diaphragm and external intercostals are the primary muscles involved in initiating inspiration. The diaphragm contracts and moves downward, increasing the size of the thoracic cavity, while the external intercostals raise the ribs and expand the chest, further increasing the space for air to enter the lungs. The rectus abdominis is not involved in inspiration, but rather in expiration by compressing the abdominal contents and forcing air out of the lungs.

Which of the Following Muscles Contract to Start Inspiration