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THFun fact: Your left lung is about 10% smaller than your right lung. This isn't a design flaw, but a clever bit of anatomical packing. The left lung has to share space with your heart, which tilts slightly to the left in your chest cavity. To accommodate this vital neighbor, the left lung features a cardiac notch—a literal indentation where the heart sits. So, while your right lung has three lobes, your left lung has only two, making it slightly more compact and efficient in its shape.
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