Vital respiratory capacity is reduced by half between ages 25 and 80 because
A)lung tissue gradually loses its elasticity.
B)the lungs shrink as their cells die.
C)the blood absorbs more oxygen and gives off less carbon dioxide.
D)the rib cage can no longer expand as much.

Question

Quizplus · Accepted Answer

Vital respiratory capacity refers to the maximum amount of air a person can exhale forcefully after taking a deep breath. This capacity decreases with age because lung tissue gradually loses its elasticity, making it harder for the lungs to expand and contract efficiently. The other options (B, C, and D) do not accurately explain the reduction in respiratory capacity with age.

Vital Respiratory Capacity Is Reduced by Half Between Ages 25