How many lobes are in the left lung?

The left lung is composed of two lobes, known as the upper lobe and the lower lobe. This anatomical structure differs from the right lung, which has three lobes: the upper, middle, and lower lobes. The distinction in the number of lobes between the two lungs is partly due to the presence of the heart, which occupies space on the left side of the thoracic cavity, leading to the reduction in size and number of lobes in the left lung. Understanding this anatomy is crucial for various respiratory health assessments and interventions.