Which of the following is concerned with the exchange of the respiratory gases?
Lungs
Bronchi
Alveoli
Trachea
The Correct Answer is C
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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
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.
Correct Answer is A
Explanation
A. CO₂ levels: Correct; central chemoreceptors are most sensitive to carbon dioxide levels.
B. K⁺ levels: Affects cardiac function more than breathing.
C. O₂ levels: Peripheral chemoreceptors respond to oxygen, but CO₂ is the primary stimulus.
D. Na⁺ levels: Affects fluid balance, not breathing regulation directly.
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