How many lobes are in the right lung and how many in the left lung?

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Lung lobes reflect how the lungs are partitioned by fissures. The right lung is divided by both a horizontal fissure and an oblique fissure, giving three lobes: superior, middle, and inferior. The left lung is divided by a single oblique fissure, yielding two lobes: superior and inferior. The heart sits on the left side, contributing to a smaller left lung and its lone oblique fissure. So, the right lung has three lobes and the left lung has two.