A form of hemoglobin where iron has been oxidized to a state that prevents it from carrying oxygen effectively.
Compound of 'ferri-' (iron in a +3 oxidation state) from Latin 'ferrum,' combined with 'hemoglobin' (the oxygen-carrying protein in blood). The term developed in the early 20th century as chemists understood blood chemistry.
When hemoglobin's iron gets oxidized too much, it essentially becomes broken and useless for carrying oxygen—it's like rust forming on your blood cells! Your body has special enzymes that constantly work to fix this and keep your hemoglobin in working condition.
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