alleryStart learning →Which medullary group stimulates the diaphragm and intercostals to produce inspiration?
AThe pneumotaxic centre of the pons
BThe apneustic centre of the pons
CThe dorsal respiratory group
DThe ventral respiratory group
Answer & Solution
Correct answer: C. The dorsal respiratory group
1. The medulla oblongata contains the dorsal respiratory group and the ventral respiratory group.
2. The dorsal respiratory group stimulates the diaphragm and intercostal muscles to contract, producing inspiration.
3. When its activity ceases those muscles relax and expiration follows.
4. The pneumotaxic and apneustic centres sit in the pons, so neither is a medullary group.
_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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