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Gas exchange between lung and blood actually happens in the:

AAbdomens
BAntrums
CAortas
DAlveolus
Answer & Solution
Correct answer: D. Alveolus
1. The site must be extremely thin. 2. Capillaries lie right against it. 3. That site is the alveolus. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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