Which lung is larger and consists of three separate lobes?

The right lung is larger than the left lung and is divided into three distinct lobes: the superior, middle, and inferior lobes. This anatomical structure accommodates the larger size and volume of the right lung, which is necessary to handle the same amount of air as the left lung despite its smaller volume.

In contrast, the left lung has only two lobes: the superior and inferior lobes. This difference is primarily due to the presence of the heart, which occupies space on the left side of the thorax, leading to a reduction in the size of the left lung. The terms "upper lung" and "lower lung" do not refer to specific lungs or their lobes, making them irrelevant in this context.