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Hemoglobin, iron-containing protein in the blood of many animals that transports oxygen to the tissues. Hemoglobin forms an unstable reversible bond with oxygen. In the oxygenated state, it is called oxyhemoglobin and is bright red; in the reduced state, it is purplish blue. Hemoglobin is a metalloprotein, chromoprotein, and globulin that facilitates the transportation of oxygen in red blood cells. It has an oxygen-binding capacity of 1.34 mL of O 2 per gram, and also transports carbon dioxide, nitric oxide, and other molecules in different organisms. Hemoglobin is an iron-rich protein in red blood cells that enables the blood to carry oxygen to tissues throughout the body. Low hemoglobin levels often indicate anemia, but high levels can also... Hemoglobin is a two-way respiratory transporter, carrying oxygen from the lungs to the tissues and working with the return carry of carbon dioxide. In the blood vessel circulation, hemoglobin has a high affinity for oxygen and a low affinity for carbon dioxide, natural phosphates, and hydrogen and chloride ions. In the venous circulation, these overall affinities are reversed. Hemoglobin is a protein inside red blood cells that transports oxygen from the lungs to tissues and organs in the ...
