Using the provided diagram, identify the structure labeled as #3.
Bronchial tree
Bronchioles
Alveoli
Bronchi
The Correct Answer is D
A. Bronchial tree: The bronchial tree refers to the entire system of airways including the trachea, bronchi, and bronchioles.
B. Bronchioles: Bronchioles are smaller airways that arise from bronchi and do not contain cartilage. They are located further down the respiratory pathway, closer to labels #5 or #6.
C. Alveoli: Alveoli are the tiny air sacs at the very end of the respiratory tract where gas exchange occurs. They are shown at label #7, not #3.
D. Bronchi: Bronchi are the major air passages that branch off from the trachea. Label #3 is pointing to a structure at this level-larger than bronchioles but smaller than the trachea. It is one of the primary or secondary bronchi.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","C","D"]
Explanation
A. Trachea: The trachea is the beginning of the lower respiratory tract and conducts air to the bronchi.
B. Pharynx: The pharynx is part of the upper respiratory system.
C. Lungs: The lungs are the primary organs of the lower respiratory tract responsible for gas exchange.
D. Bronchial tree: The bronchial tree, including bronchi and bronchioles, is part of the lower respiratory system.
E. Larynx: The larynx is the uppermost structure of the lower respiratory system in some classifications but is more commonly considered part of the upper respiratory tract.
Correct Answer is C
Explanation
A. Bronchioles- bronchioles are airways that lead to alveoli but are not where gas exchange occurs.
B. Trachea- this is a conduction pathway for air, not where diffusion of gases happens.
C. Pulmonary capillaries- oxygen diffuses across the alveolar membrane into the pulmonary capillaries for transport in the blood.
D. Lungs- this is too broad; gas exchange occurs specifically at the alveolar-capillary membrane.
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