Blood - Red blood cells, formed by erythropoiesis, contain hemoglobin that transports respiratory gases - Hemoglobin
3 important questions on Blood - Red blood cells, formed by erythropoiesis, contain hemoglobin that transports respiratory gases - Hemoglobin
What is hemoglobin's structure?
Quaternary structure with two alpha and two beta chains of polypeptides. Each chain has a single heme molecule (non protein pigment complex that forms a ring). Heme units hold an iron ion that allows for oxygen molecule interaction.
Oxyhemoglobin (HbO2) vs Deoxyhemoglobin
Oxyhemoglobin has an oxygen molecule bound to its heme units; blood is bright red.
The iron-oxygen interaction is weak and reversible, dissociation of oxygen leaves a hemoglobin molecule whose iron has no oxygen bound -> deoxyhemoglobin (blood is dark red).
The iron-oxygen interaction is weak and reversible, dissociation of oxygen leaves a hemoglobin molecule whose iron has no oxygen bound -> deoxyhemoglobin (blood is dark red).
What is fetal hemoglobin?
Binds oxygen more readily, allowing a fetus to steal oxygen from the maternal blodo stream at the plancea.
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