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Which of the following is concerned with the exchange of the respiratory gases?

A.

Lungs

B.

Bronchi

C.

Alveoli

D.

Trachea

Answer and Explanation

The Correct Answer is C

A. Lungs:  lungs house alveoli but are not the site of gas exchange themselves.

B. Bronchi:  they conduct air but don’t exchange gases.

C. Alveoli:  this is the primary site where oxygen and carbon dioxide are exchanged.

D. Trachea:  it’s a passageway for air, not a site for gas exchange.


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Related Questions

Correct Answer is B

Explanation

A. Larynx: The larynx is located below the pharynx and above the trachea. It houses the vocal cords and plays a role in speech. In the diagram, the larynx is likely structure #6, not #4.

B. Pharynx: The pharynx is a muscular passageway for food and air. It lies behind the nasal cavity and mouth, connecting them to the larynx and esophagus. Structure #4 is positioned in that area, making it the correct answer.

C. Trachea: The trachea is the windpipe that extends from the larynx downward into the chest. It is shown lower in the diagram (likely structure #7), not #4.

D. Nose: The nose (including the nostrils and nasal cavity) is the outermost and uppermost part of the respiratory tract. In the diagram, structure #3 appears to represent the nose, not #4.

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.

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