Question

which of the following pairs is mismatched?
a apex—tip of lung
b base—bottom section of lung
c hilum—area where trachea enters the lungs
d pleura—sac around lungs

Explanation:

The hilum is the area where the bronchi, blood - vessels, and nerves enter and leave the lungs, not where the trachea enters. The trachea divides into the left and right bronchi which then enter the lungs at the hilum.

Answer:

C. hilum—area where trachea enters the lungs