The definition of hemoglobin

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The definition of hemoglobin

About 95 percent of the dry weight of the red blood cell consists of hemoglobin, the substance necessary for oxygen transport. Hemoglobin is a protein; a molecule contains four polypeptide chains a tetramereach chain consisting of more than amino acids.

Definition

To each… Hemoglobin develops in cells in the bone marrow that become red blood cells. When red cells die, hemoglobin is broken up: Each hemoglobin molecule is made up of four heme groups surrounding a globin group, forming a tetrahedral structure.

Heme, which accounts for only 4 percent of the weight of the molecule, is composed of a ringlike organic compound known as a porphyrin to which an iron atom is attached.

It is the iron atom that binds oxygen as the blood travels between the lungs and the tissues. There are four iron atoms in each molecule of hemoglobin, which accordingly can bind four atoms of oxygen. Globin consists of two linked pairs of polypeptide chains.

Hemoglobin S is a variant form of hemoglobin that is present in persons who have sickle cell anemiaa severe hereditary form of anemia in which the cells become crescent-shaped when oxygen is lacking. The abnormal sickle-shaped cells die prematurely and may become lodged in small blood vessels, potentially obstructing the microcirculation and leading to tissue damage.

The sickling trait is found mainly in people of African descent, though the disease also occurs in persons of Middle Eastern, Mediterranean, or Indian descent. Learn More in these related Britannica articles:Comments on oxy.

What made you want to look up oxy?Please tell us where you read or heard it (including the quote, if possible). Barter definition, to trade by exchange of commodities rather than by the use of money.

See more. Anemia definition, a quantitative deficiency of the hemoglobin, often accompanied by a reduced number of red blood cells and causing pallor, weakness, and breathlessness. See more.

The definition of hemoglobin

Anemia definition, a quantitative deficiency of the hemoglobin, often accompanied by a reduced number of red blood cells and causing pallor, weakness, and breathlessness.

See more. A fetal hemoglobin test (Hgb electrophoresis) measures the level of fetal hemoglobin (Hemoglobin F or HbF) in the blood of infants and children.

to cause (blood) to undergo a physiological change in which the hemoglobin becomes dissolved in the plasma.

Oxyhemoglobin Dissociation Curve