These respiratory structures are made up of mostly smooth muscles and determine the flow of air to the alveoli:
Bronchi
Larynx
Bronchioles
Trachea
The Correct Answer is C
A. Bronchi: Contain cartilage and some smooth muscle but are not the primary regulators of airflow.
B. Larynx: Functions in sound production and airway protection, not airflow regulation to alveoli.
C. Bronchioles: Correct; they are lined with smooth muscle that controls airflow to alveoli.
D. Trachea: A rigid structure with cartilage rings; does not regulate airflow via muscle tone.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
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.
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.
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