Maximum vital lung capacity
A) declines by 5 percent per decade throughout the lifespan.
B) declines by 10 percent per decade after age 25.
C) remains constant until about age 50.
D) increases by 10 percent per decade after age 25.

Question

Quizplus · Accepted Answer

Maximum vital lung capacity, also known as maximum inspiratory capacity, declines by about 10 percent per decade after age 25 due to a combination of factors such as decreased lung elasticity, weakened respiratory muscles and loss of lung tissue. Therefore, option B correctly represents the decline rate of maximum vital lung capacity throughout the lifespan.

Maximum Vital Lung Capacity