You would MOST likely see an increased end-tidal CO2 reading in an otherwise healthy older adult because:
A) the vital capacity in late adulthood amounts to only 20% of the vital capacity noted in young adulthood.
B) residual volume increases with age, resulting in stagnant air remaining in the alveoli and hampering gas exchange.
C) many older adults experience idiopathic atrophy of the diaphragm and are unable to breathe in adequate tidal volumes.
D) as respiratory muscle mass increases with age, the older adult experiences increasing difficulty with inspiration and expiration.
Answer: B) residual volume increases with age, resulting in stagnant air remaining in the alveoli and hampering gas exchange.
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