Why is breathing often more difficult in older adults?

• A. Elasticity of the lungs decreases
• B. Surface area of the alveoli increases
• C. Overall size of the airway decreases
• D. Diaphragm and intercostal muscles enlarge

Answer: (A)

Breathing becomes more challenging for older adults primarily due to the decreasing elasticity of the lungs. As people age, the lung tissue undergoes structural changes that reduce its ability to stretch and recoil. This loss of elasticity can make it harder for the lungs to efficiently fill with air and expel carbon dioxide. The aging process may also lead to a stiffening of the chest wall and a weakening of the respiratory muscles, further complicating the breathing process.

In contrast, the other options describe changes that either do not occur or would not typically make breathing more difficult. For example, an increase in the surface area of the alveoli would generally enhance gas exchange, thus facilitating rather than hindering breathing. Similarly, a decrease in the size of the airway would not account for the difficulties faced. While there may be some increase in the size or strength of respiratory muscles due to training or conditioning, this is not the norm for the aging adult.