A protein compound found in red blood cells that carries oxygen throughout the body.
From hemo- (Greek haima, blood) + globulin (from Latin globus, sphere). Named for its spherical protein structure and its primary function in blood, this term became standard in the 19th century with advances in biochemistry.
Hemoglobin is so clever—it grabs oxygen in your lungs where oxygen is plentiful, then releases it in your muscles where it's needed; it's like a molecular delivery driver following supply and demand.
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