Hemoglobin is the red protein in your blood cells that carries oxygen from your lungs to the rest of your body. It also helps carry some waste carbon dioxide back to your lungs to be breathed out.
From Greek “haima” meaning “blood” and “-globin,” related to “globule,” meaning a small ball or sphere of protein. So hemoglobin is literally a blood protein shaped like a tiny globe.
Each hemoglobin molecule can grab onto oxygen like a tiny delivery truck and then drop it off where your cells need it. The iron inside hemoglobin is what makes your blood look red, so you could say your blood is red because of metal. Without hemoglobin, every breath you take would be almost useless to your body.
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