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The respiratory system divides into how many zones?

ATwo
BNine
CSix
DTen
Answer & Solution
Correct answer: A. Two
1. The division is functional, not anatomical. 2. One zone carries air and one exchanges gas. 3. The respiratory system can be divided into a conducting zone and a respiratory zone. 4. So the answer is two. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 22 'The Respiratory System'_
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