The nurse clarifies that the cough mechanism is stimulated when:
more than 250 mL of air moves in and out of the lungs with each breath
foreign substances are propelled by the cilia toward the respiratory tract
dehumidified air enters the upper airway passages
the blood transports carbon dioxide to the lungs
The Correct Answer is B
A. More than 250 mL of air moves in and out of the lungs with each breath: This describes tidal volume but does not directly stimulate the cough mechanism.
B. Foreign substances are propelled by the cilia toward the respiratory tract: Irritation by foreign particles stimulates the cough reflex to clear the airways.
C. Dehumidified air enters the upper airway passages: Dry air can cause airway irritation but does not consistently trigger a cough reflex.
D. The blood transports carbon dioxide to the lungs: This describes gas exchange, which does not directly relate to triggering the cough mechanism.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Bradypnea: Hypoxia typically leads to tachypnea as the body attempts to increase oxygen intake.
B. Pallor: While it can be a sign of poor perfusion, cyanosis is more closely associated with hypoxia.
C. Cyanosis: A late sign of severe hypoxia, indicating a lack of oxygen in the tissues.
D. Bradycardia: Hypoxia usually stimulates tachycardia as the body tries to compensate.
Correct Answer is A
Explanation
A. Oxygen diffuses across the alveolar membrane into the blood: This is the primary function of the respiratory system, ensuring oxygenation of blood.
B. The alveoli have cilia that help remove foreign particles: Cilia are present in the respiratory tract, but not in the alveoli.
C. The diaphragm controls respiration: The diaphragm assists with breathing but does not "control" respiration, which is regulated by the brainstem.
D. The bronchioles contain macrophages that phagocytize inhaled bacteria: Macrophages are found in alveoli, not the bronchioles.
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