The process of blood formation or oxygenation of blood, especially as it occurs in the lungs.
From Greek haima (blood) + -osis (process or condition). This term refers to the physiological conversion of venous blood to arterial blood through oxygenation.
Before we understood cells and chemistry, 'hematosis' was how doctors described the mysterious transformation that happens in the lungs—a reminder that ancient terms sometimes described real phenomena they just couldn't fully explain.
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