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. 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.
Correct Answer is C
Explanation
A. Pharynx: Transports air but is not primarily responsible for warming/moistening.
B. Larynx: Functions in voice production and airway protection.
C. Nostrils/nares: Correct; nasal passages warm, moisten, and filter the air.
D. Alveoli: Site of gas exchange, not air conditioning.
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