Approximately how many alveoli are there in a 10-year-old's lung?
a. 50 million
b. 200 million
c. 350 million
d. 480 million
ANS: D
The human lung continues to develop alveoli for years until it reaches a stable stage where the total numbers have increased to approximately 480 million alveoli. All of the development is complete by 10 years of age.
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