Carbaminohemoglobin forms when carbon dioxide binds to which part of hemoglobin?

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Multiple Choice

Carbaminohemoglobin forms when carbon dioxide binds to which part of hemoglobin?

Carbaminohemoglobin forms when carbon dioxide binds to amino groups on the globin protein portion of hemoglobin, usually the N-terminal amino groups of the globin chains. This creates a reversible carbamino compound that helps transport CO2 in the blood and facilitates oxygen release in tissues by lowering hemoglobin’s affinity for O2 (the Bohr effect). This form is distinct from binding to the heme iron. Carbon monoxide, not CO2, binds to iron in the heme to form carboxyhemoglobin. Additionally, CO2 can travel dissolved in plasma or be converted to bicarbonate inside red blood cells, but carbaminohemoglobin specifically requires CO2 attaching to the globin amino groups.

Carbaminohemoglobin forms when carbon dioxide binds to amino groups on the globin protein portion of hemoglobin, usually the N-terminal amino groups of the globin chains. This creates a reversible carbamino compound that helps transport CO2 in the blood and facilitates oxygen release in tissues by lowering hemoglobin’s affinity for O2 (the Bohr effect). This form is distinct from binding to the heme iron. Carbon monoxide, not CO2, binds to iron in the heme to form carboxyhemoglobin. Additionally, CO2 can travel dissolved in plasma or be converted to bicarbonate inside red blood cells, but carbaminohemoglobin specifically requires CO2 attaching to the globin amino groups.

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