An 80-Year-Old Man Has Been Participating in a Longitudinal Study

An 80-year-old man has been participating in a longitudinal study of aging.  He has no major medical conditions.  Arterial blood gas samples are obtained every decade, on room air at sea level, to monitor long-term changes in pulmonary gas exchange.  Compared to 30 years ago, which of the following results is most consistent with normal aging?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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