Which transport mechanism causes the respiratory gases (O2, CO2) to move between the alveoli and pulmonary capillaries?
Osmosis
Active transport pump
Filtration
Diffusion
The Correct Answer is D
A. Osmosis: Osmosis refers to the movement of water across a membrane, not gases.
B. Active transport pump: Gas exchange does not require energy; it is a passive process, not active transport.
C. Filtration: Filtration is driven by hydrostatic pressure and is more relevant to kidneys and capillary exchange of fluids.
D. Diffusion: Diffusion is the passive movement of gases from an area of higher concentration to an area of lower concentration-how O₂ and CO₂ exchange occurs across the alveolar-capillary membrane.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Cyanosis: Cyanosis is a common sign of hypoxia caused by low oxygen levels in the blood.
B. Bradycardia: Hypoxia typically causes tachycardia, not bradycardia.
C. Pallor: Pallor may indicate anemia or poor circulation, not specifically hypoxia.
D. Bradypnea: Hypoxia usually triggers an increased respiratory rate (tachypnea), not bradypnea.
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.
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