Where does this come from, and can I check it?

The left lung features two lobes instead of three to make room for the heart. The figure is taken from MedlinePlus, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a human body fact?

Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The right lung is larger than the left lung

The left lung features two lobes instead of three to make room for the heart

To accommodate the cardiac apex pointing leftward, the left lung is slightly smaller than the right lung and has only two lobes instead of three. It features a concave notch called the cardiac impression where the heart rests within the chest cavity.

Human Lungs (NIH BioArt 231 - 630887) — Courtesy of NIAID Ryan Kissinger · Public domain · source

Where this comes from

MedlinePlus

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Tags: lungs, heart, anatomy

The right lung is larger than the left lung: the short answers

Where does this come from, and can I check it?: The left lung features two lobes instead of three to make room for the heart. The figure is taken from MedlinePlus, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.