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Hemoglobin (haemoglobin, [a] Hb or Hgb) is a protein containing iron that facilitates the transportation of oxygen in red blood cells. Almost all vertebrates contain hemoglobin, [ 3 ] with the sole exception of the fish family Channichthyidae . [ 4 ]
Hemoglobin A is the most common adult form of hemoglobin and exists as a tetramer containing two alpha subunits and two beta subunits (α2β2). [3] Hemoglobin A2 (HbA2) is a less common adult form of hemoglobin and is composed of two alpha and two delta-globin subunits. This hemoglobin makes up 1-3% of hemoglobin in adults. [4]
Print/export Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... 0.5-1.5% total Hb smokers, 1-2 packs/day
Hemoglobin D has the basic structure and composition of normal adult hemoglobin. It is a globular protein containing prosthetic (non-protein) group called heme. There are four individual peptide chains, namely two α- and two β-subunits, each made of 141 and 146 amino acid residues, respectively.
In other words, the chemical compound would be designated with a capital letter, but specific instances in structures with lowercase. Thus cytochrome oxidase, which has two A hemes (heme a and heme a 3) in its structure, contains two moles of heme A per mole protein. Cytochrome bc 1, with hemes b H, b L, and c 1, contains heme B and heme C in a ...
The combined surface area of all red blood cells of the human body would be roughly 2,000 times as great as the body's exterior surface. [ 14 ] 4,000–11,000 leukocytes : [ 15 ] White blood cells are part of the body's immune system ; they destroy and remove old or aberrant cells and cellular debris, as well as attack infectious agents ...
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Some normal hemoglobin types are; Hemoglobin A (Hb A), which is 95–98% of hemoglobin found in adults, Hemoglobin A2 (Hb A2), which is 2–3% of hemoglobin found in adults, and Hemoglobin F (Hb F), which is found in adults up to 2.5% and is the primary hemoglobin that is produced by the fetus during pregnancy.