Which of the following muscles increases the volume of the thorax during a normal inhalation? (1)diaphragm
(2)external intercostals
(3)internal intercostals
(4)rectus abdominis
A)1,2
B)1,3
C)2,3
D)2,4
E)3,4

Question

Quizplus · Accepted Answer

The diaphragm and external intercostals are muscles that contract during a normal inhalation, increasing the volume of the thorax and causing air to flow into the lungs. The internal intercostals and rectus abdominis are involved in exhalation, not inhalation.

Which of the Following Muscles Increases the Volume of the Thorax