The process of oxygenation of blood as it passes through the lungs, or the formation of blood.
From Greek 'haima' (blood) + suffix '-osis' (process or condition), describing the process of blood becoming oxygenated.
Haematosis is why breathing is life—your lungs perform haematosis billions of times, swapping carbon dioxide waste for fresh oxygen in a process so efficient that a single lung full of air can oxygenate your entire blood supply.
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