alleryStart learning →Which accessory muscles contract during forced inspiration?
ANeck muscles including the scalenes
BAbdominal muscles including the obliques
CInternal intercostals of the rib cage
DPelvic floor and lower back muscles
Answer & Solution
Correct answer: A. Neck muscles including the scalenes
1. Forced breathing uses muscle contraction for both inspiration and expiration.
2. During forced inspiration the neck muscles, including the scalenes, contract.
3. They lift the thoracic wall and so increase lung volume.
4. The obliques and internal intercostals act during forced expiration instead, which is what the second and third options describe.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.3 The Process of Breathing_
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