How many lobar bronchi are present in the left lung?

• A. 3
• B. 5
• C. 2
• D. 4

Answer: (C)

The left lung has two lobar bronchi, corresponding to its anatomical structure. The left lung is divided into two lobes: the upper lobe and the lower lobe, each served by a separate lobar bronchus. The upper lobe is supplied by the left main bronchus that branches into the left superior lobar bronchus, and the lower lobe is supplied by the left inferior lobar bronchus.

In contrast, the right lung has three lobes, thus possessing three lobar bronchi: the right upper lobe, middle lobe, and lower lobe, which explains why the left lung's bronchial structure is indeed different with only two lobar bronchi. This anatomical distinction is crucial for understanding respiratory physiology and the implications of pulmonary diseases which may affect each lung lobe differently.