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Metalloprotein complexes in red blood cells bind oxygen in lungs and release it to tissues. The figure is taken from Smithsonian, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mondo Knows Facts

Hemoglobin uses iron to transport oxygen through blood

Metalloprotein complexes in red blood cells bind oxygen in lungs and release it to tissues

Hemoglobin is an iron-bearing protein responsible for carrying oxygen throughout the circulatory systems of vertebrates. Each hemoglobin molecule contains four heme groups with central iron ions capable of reversibly binding oxygen molecules in high-oxygen lung environments. The binding of oxygen changes the protein structure, giving oxygenated arterial blood its bright red colour.

Кров людини (дитини) з анізоцитозом. Human Blood (Child) with Anisocytosis — Chrystyna Martyniuk,Yana Kovalova, Dmytro Marchuk · CC BY-SA 4.0 · licence · source

Where this comes from

Smithsonian

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Tags: biology, hemoglobin, blood

Hemoglobin uses iron to transport oxygen through blood: the short answers

Where does this come from, and can I check it?: Metalloprotein complexes in red blood cells bind oxygen in lungs and release it to tissues. The figure is taken from Smithsonian, 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 science fact?: Yes. It sits on the Science 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.