Which of the following is NOT descriptive of the alveoli?
Grapelike sacs located very close to pulmonary capillaries
Located within the lungs
Primarily concerned with gas exchange
Contain smooth muscle
The Correct Answer is D
A. Grapelike sacs located very close to pulmonary capillaries: This correctly describes the structure of alveoli.
B. Located within the lungs: Alveoli are indeed located in the lungs.
C. Primarily concerned with gas exchange: Alveoli are the main site of gas exchange in the lungs.
D. Contain smooth muscle: Alveoli do not contain smooth muscle; this is a feature of bronchi and bronchioles.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
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.
Correct Answer is B
Explanation
A. 90-95%: acceptable in some chronic conditions, but not the ideal normal.
B. 95-100%: this is the normal range for oxygen saturation in healthy adults.
C. 86-89%: indicates hypoxemia.
D. 80-85%: severely hypoxic, needs medical attention.
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