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A single human lung holds roughly how many alveoli?

A300 hundred
B300 thousand
C300 million
D300 dozen
Answer & Solution
Correct answer: C. 300 million
1. The lung feels spongy for a reason. 2. Huge numbers give huge surface area. 3. There are about 300 million. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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