Each lung is divided into upper and lower lobes. The right lung is larger and heavier than the left lung, which is somewhat smaller in size because of the position of the heart. The upper lobe of the right lung contains another triangular subdivision known as the middle lobe.
The heart is asymmetrical and is more on the left side of the body than on the right. Thus it follows that the left lung is smaller because there’s a heart in the way.
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