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Which of the following structures are part of the lower respiratory tract? (Select All that Apply)

A.

Trachea

B.

Pharynx

C.

Lungs

D.

Bronchial tree

E.

Larynx

Answer and Explanation

Correct Answer : A,C,D

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.


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Related Questions

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.

Correct Answer is A

Explanation

A. It is difficult to keep the alveoli open- surfactant reduces alveolar surface tension; without it, alveoli collapse (atelectasis).

B. Bronchioles relax- not directly related to surfactant.

C. The alveoli fill with water- surfactant prevents collapse, not water entry.

D. Air enters the intrapleural space- this would cause a pneumothorax, unrelated to surfactant function.

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