Bronchi are best described as which anatomical structures?

• A. The main windpipe
• B. Two short branches located at the lower end of the trachea that carry air into the lungs
• C. The smallest airways in the lungs
• D. The air sacs where gas exchange occurs

Answer: (B)

Bronchi are the two main branches that split from the lower end of the trachea and enter each lung, carrying air into the lungs. This split occurs at the carina, and the bronchi then branch into smaller airways within the lungs. They’re part of the conducting airways and are supported by cartilage to keep the passage open. They are not the main windpipe itself (that’s the trachea), not the smallest airways (those are bronchioles), and not the gas-exchange sites (those are alveoli). The description of two branches at the lower end of the trachea that carry air into the lungs matches bronchi.