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The respiratory system divides functionally into a respiratory zone and a zone that is:

AConducting
BConnecting
CConcluding
DContracting
Answer & Solution
Correct answer: A. Conducting
1. One zone actually performs gas exchange. 2. The other simply carries air to and from it. 3. That carrying part is the conducting zone. _Source: OpenStax Anatomy and Physiology 2e, Chapter 22, The Respiratory System._
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