Which of the following is concerned with the exchange of the respiratory gases?
Lungs
Bronchi
Alveoli
Trachea
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 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.
Correct Answer is D
Explanation
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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