Which of the following changes in the respiratory system of the aging population is the main reason why they are at greater risk for respiratory infections?
Decreased efficiency of the respiratory muscles
Loss of elasticity of the lung tissue
The phagocytes in the lungs become less effective
Number of alveoli decreases
The Correct Answer is C
A. Decreased efficiency of the respiratory muscles: Affects ventilation but not directly related to infection susceptibility.
B. Loss of elasticity of the lung tissue: Affects gas exchange but doesn't impair immune defense.
C. The phagocytes in the lungs become less effective: Correct; weakened immune response increases infection risk.
D. Number of alveoli decreases: Affects surface area for gas exchange, not immune function.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Surrounded by rings of cartilage: Only the larger bronchi are surrounded by cartilage; bronchioles and alveoli are not.
B. Upper respiratory structures: These are part of the lower respiratory tract.
C. Collectively referred to as the bronchial tree: This is the correct term for the branching airway system from the trachea to alveoli.
D. The sites of the exchange of respiratory gases: Only the alveoli are directly involved in gas exchange.
Correct Answer is C
Explanation
A. Lungs: lungs house alveoli but are not the site of gas exchange themselves.
B. Bronchi: they conduct air but don’t exchange gases.
C. Alveoli: this is the primary site where oxygen and carbon dioxide are exchanged.
D. Trachea: it’s a passageway for air, not a site for gas exchange.
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