noun Biochemistry.

  1. See under hemoglobin.

noun Biochemistry.

  1. the oxygen-carrying pigment of red blood cells that gives them their red color and serves to convey oxygen to the tissues: occurs in reduced form (deoxyhemoglobin) in venous blood and in combination with oxygen (oxyhemoglobin) in arterial blood. Symbol: Hb

n.coloring matter in red blood stones, 1862, shortening of h√¶matoglobin (1845), from Greek haimato-, comb. form of haima (genitive haimatos) “blood” (see -emia) + globulin, a type of simple protein, from globule, formerly a word for “corpuscle of blood.” n.

  1. Hemoglobin in combination with oxygen, present in arterial blood.oxygenated hemoglobin


  1. The red respiratory protein of red blood cells that transports oxygen as oxyhemoglobin from the lungs to the tissues, where the oxygen is readily released and the oxyhemoglobin becomes hemoglobin.

  1. The compound formed when a molecule of hemoglobin binds with a molecule of oxygen. In vertebrate animals, oxyhemoglobin forms in the red blood cells as they take up oxygen in the lungs. See Note at hemoglobin.

  1. An iron-containing protein present in the blood of many animals that, in vertebrates, carries oxygen from the lungs to the tissues of the body and carries carbon dioxide from the tissues to the lungs. Hemoglobin is contained in the red blood cells of vertebrates and gives these cells their characteristic color. Hemoglobin is also found in many invertebrates, where it circulates freely in the blood. It consists of four peptide units, each attached to a nonprotein compound called heme that binds to oxygen. See Note at red blood cell.

A complex organic molecule (see also organic molecules) containing iron that carries oxygen in the blood.

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