Question 2

Alveoli are affected by diseases that disrupt gas exchange, such as emphysema.

Emphysema primarily impacts the alveoli, which are the tiny air sacs in the lungs where gas exchange occurs. This disease damages the walls of the alveoli, reducing their surface area and impairing the ability to take in oxygen and expel carbon dioxide.

A) Trachea

The trachea is the windpipe that conducts air to the bronchi and is not directly involved in the gas exchange process. While diseases can affect the trachea, it does not play a role in the disruption of gas exchange like emphysema does.

B) Alveoli

Alveoli are the primary sites of gas exchange in the lungs. In emphysema, the destruction of the alveolar walls leads to a decrease in surface area for gas exchange, making this option the correct answer.

C) Secondary bronchi

The secondary bronchi branch from the primary bronchi and lead to the lungs but do not participate in gas exchange themselves. Therefore, they are not directly affected by diseases like emphysema that disrupt gas exchange at the alveolar level.

D) Primary bronchi

Similar to the secondary bronchi, the primary bronchi serve as passageways for air to enter the lungs but are not involved in gas exchange. Diseases like emphysema do not primarily impact these structures.

Conclusion

The alveoli are critical for effective gas exchange, and emphysema's effects on them directly impair respiratory function. Other options, such as the trachea and bronchi, do not play a role in the gas exchange process and thus are not affected by diseases that primarily disrupt this vital function.