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heme |
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heme (hēm) an iron compound of protoporphyrin which constitutes the pigment portion or protein-free part of the hemoglobin molecule and is responsible for its oxygen-carrying properties.
Heme The iron-containing molecule in hemoglobin that serves as the site for oxygen binding. heme [hēm] Etymology: Gk, haima, blood the pigmented iron-containing nonprotein part of the hemoglobin molecule. There are four heme groups in a hemoglobin molecule, each consisting of a cyclic structure of four pyrrole residues, called protoporphyrin, and an atom of iron in the center. Heme binds and carries oxygen in the red blood cells, releasing it to tissues that give off excess amounts of CO2. Also spelled haeme. See also hemoglobin, porphobilinogen, protoporphyrin. heme, n the pigmented, iron-contain-ing, nonprotein portion of the hemoglobin molecule. heme the nonprotein, insoluble, iron protoporphyrin constituent of hemoglobin, of various other respiratory pigments, and of many cells, both animal and vegetable. It is an iron compound of protoporphyrin and so constitutes the pigment portion or protein-free part of the hemoglobin molecule, and is responsible for its oxygen-carrying properties. heme pigment nephropathy see hemoglobinuric nephrosis. heme synthetase the rate-controlling enzyme for the synthesis of heme. heme An iron-containing red pigment which, with a protein, globin, forms hemoglobin How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Haematomyzus Haematopinus Haematopota Haematosiphon Haematoxenus haematuria haeme Hæmin haemo- Haemobartonella haemochromatosis haemoconcentration haemodialysis haemodilution Haemodipsus |
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