Which of the following muscles are considered primary muscles of ventilation?
1) Diaphragm
2) Intercostals
3) Scalenes
4) Sternomastoid
A)1, 3, and 4
B)1 and 2
C)3 only
D)1, 2, 3, and 4

Question

Quizplus · Accepted Answer

The diaphragm and intercostal muscles (particularly the external intercostals) are considered the primary muscles of ventilation. The scalenes and sternomastoid muscles are accessory muscles of ventilation that may be recruited during increased demand or respiratory distress, but they are not considered primary muscles of ventilation.

Which of the Following Muscles Are Considered Primary Muscles of Ventilation