Yao is 45 years old.How has the maximum vital capacity of his lungs changed from when he was 25?
A)It has decreased by about 5 percent.
B)It has decreased by about 20 percent.
C)It has remained constant.
D)It has increased by about 10 percent.

Question

Quizplus · Accepted Answer

As a person ages, their maximum vital capacity (the maximum amount of air that can be exhaled after a deep inhalation) decreases due to a decrease in lung elasticity and muscle strength. Studies have shown that on average, vital capacity decreases by about 1% per year after the age of 25. Therefore, at the age of 45, Yao's maximum vital capacity would have decreased by approximately 20%.

Yao Is 45 Years Old