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Smooth muscle narrows the trachea so air rushes out hard. That helps us:

ACreep
BCough
CCount
DCrawl
Answer & Solution
Correct answer: B. Cough
1. Mucus must be pushed out. 2. A fast blast of air does it. 3. That action is a cough. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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