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There are a few differences between the two lungs:
- The left lung is smaller in volume than the right lung, with a smaller transverse dimension (due to the heart on the left) but a larger longitudinal dimension (due to the liver causing the right hemidiaphragm to be higher than the left).
- The left main bronchus also differs to the right main bronchus, as it is shorter, smaller caliber and more horizontal.
- The left lung has just one fissure: the oblique fissure.
- The left lung contains 2 lobes and 8 bronchopulmonary segments:
- left upper lobe
- left lower lobe
For a detailed description of lung anatomy and function, see the lung article here.