alleryExternal intercostal muscles contract and:
ALower the ribs
BClose the glottis
CSqueeze the lungs
DLift the ribs
Answer & Solution
Correct answer: D. Lift the ribs
1. These muscles sit between the ribs.
2. Their contraction raises the ribs and sternum.
3. That widens the chest.
_Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._
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