The area in the lungs where oxygen and carbon dioxide are exchanged is called the:

Question

BlackTom AI · Accepted Answer

To tackle the question, let's examine what each anatomical term refers to in the respiratory system.
Option 1: pleura. The pleura are membranes surrounding the lungs and lining the chest cavity; they protect and reduce friction during breathing, but they are not the site of gas exchange. Therefore this option is incorrect for the stated function.
Option 2: alveoli. Alveoli are tiny air sacs where the walls are extremely thin and richly supplied with capillaries; this is precisely where oxygen diffuses into the blood and carbon dioxide diffuses out. This is the correct anatomical site for gas exchange.
Option 3: bronchus. A bronchus is a major airway that conducts air into the lungs from the trachea; it transports air but does not participate in the actual exchange of gases with the bloodstream. Hence, this choice does not describe the gas-exchange area.
Option 4: bronchioles. Bronchioles are smaller airways branching from the bronchi, guiding air to the alveolar sacs; while they play a role in air delivery, they are not the primary site of gas exchange themselves. The gas exchange occurs across the alveolar walls, not within the bronchioles.
Overall, the reasoning centers on identifying the structure where the blood–air barrier is formed and where diffusion of gases occurs. The alveolar compartments provide the large surface area and close contact with capillaries necessary for this diffusion process, setting it apart from the other structures listed which serve supportive or conduit roles in ventilation rather than the exchange of gases.

The area in the lungs where oxygen and carbon dioxide are exchanged is called the:单项选择题

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