An Elderly Guy in His 80s Has Been Taking Part

An elderly guy in his 80s has been taking part in a longitudinal study of aging. He doesn't have any serious medical issues. In order to track long-term changes in pulmonary gas exchange, arterial blood gas samples are taken once every ten years on room air at sea level. Which of the following outcomes is most consistent with normal aging as compared to 30 years ago?

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

Correct Answer:

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