alleryStart learning →Which two muscle groups act during normal quiet inspiration?
AThe scalenes and the internal intercostals
BThe obliques and the internal intercostals
CThe diaphragm and the abdominal obliques
DThe diaphragm and the external intercostals
Answer & Solution
Correct answer: D. The diaphragm and the external intercostals
1. Quiet breathing at rest uses only two muscle groups on inspiration.
2. They are the diaphragm and the external intercostal muscles.
3. So the fourth option is correct.
4. The scalenes, obliques and internal intercostals are accessory muscles recruited only during forced breathing.
_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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