CPFT Practice Exam 2026 – Complete Test Prep Guide

The correct choice is centered on the physiological changes that occur in the lungs and respiratory muscles as a person ages. As individuals grow older, several factors contribute to a decline in pulmonary function.

One significant change is decreased lung compliance. Lung compliance refers to the ability of the lung to stretch and expand during breathing. With aging, the connective tissues in the lungs may become stiffer and less elastic, resulting in reduced compliance. This change means that the lungs cannot expand as readily, which can lead to decreased airflow and difficulty in taking deep breaths.

Additionally, the elasticity of the lung tissues diminishes over time. Elasticity is crucial for the proper functioning of the lungs as it allows for the effective recoil of the lungs after inhalation, facilitating the expulsion of air during exhalation. A loss of elasticity can lead to air trapping and reduced overall lung volumes.

Moreover, respiratory muscle strength tends to decline with age. The diaphragm and intercostal muscles, which are integral to the mechanics of breathing, may weaken over time. This diminished strength can compromise the effectiveness of ventilation, making it more challenging to maintain adequate oxygenation and carbon dioxide elimination.

These age-related changes collectively contribute to a decline in pulmonary function, affecting both the mechanics of breathing and the efficiency