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hemoglobin
noun
he·mo·glo·bin ˈhē-mə-ˌglō-bən 
1
: an iron-containing respiratory pigment of vertebrate red blood cells that consists of a globin composed of four subunits each of which is linked to a heme molecule, that functions in oxygen transport to the tissues after conversion to oxygenated form in the gills or lungs, and that assists in carbon dioxide transport back to the gills or lungs after surrender of its oxygen
Did you know?
When filled with oxygen, the hemoglobin in your blood is bright red; returning to the lungs without its oxygen, it loses its brightness and becomes somewhat bluish. Hemoglobin levels can change from day to day, and may be affected by such factors as a lack of iron in the diet, a recent loss of blood, and being pregnant. When you give blood, a nurse first pricks your finger to test your hemoglobin level; a low hemoglobin count indicates anemia and may mean that you shouldn't give blood that day. Mild anemia is generally of little importance, but some types can be very serious.
Example Sentences
Recent Examples on the Web The next parameter is tissue oxygenation in the leg muscles, as measured with near-infrared spectroscopy, which basically involves shining infrared light through the skin and measuring how much is absorbed by oxygen-rich hemoglobin. 
Alex Hutchinson, Outside Online, 25 Nov. 2020 Since iron is an important component of hemoglobin, iron loss often accompanies a lot of bleeding. Jason Karp, Outside Online, 14 Mar. 2014 These diseases impair hemoglobin, a protein in red blood cells that carries oxygen. New York Times, 27 June 2022 Sickle cell disease is caused by a mutation in the gene for hemoglobin, an oxygen-carrying protein in the blood. Ryan Cross, BostonGlobe.com, 28 June 2022 By the spring of 2019, her hemoglobin level was back to normal. Beth Bragg, Anchorage Daily News, 10 Sep. 2021 When chemotherapy during an arduous battle with leukemia destroyed much of her platelets and hemoglobin in 2019, transfusions helped replace the proteins needed to carry oxygen throughout her body. Abigail Hasebroock, Orlando Sentinel, 20 June 2022 In truth, the Teichmann Test had been in use since 1853, a conclusive test based on microcrystal formation in reaction to hemoglobin. Roy Schwartz, CNN, 20 May 2022 Donors receive a free mini-health screening with information on pulse, blood pressure and hemoglobin. Laura Groch, San Diego Union-Tribune, 13 Apr. 2022 See More
Alex Hutchinson, Outside Online, 25 Nov. 2020 Since iron is an important component of hemoglobin, iron loss often accompanies a lot of bleeding. Jason Karp, Outside Online, 14 Mar. 2014 These diseases impair hemoglobin, a protein in red blood cells that carries oxygen. New York Times, 27 June 2022 Sickle cell disease is caused by a mutation in the gene for hemoglobin, an oxygen-carrying protein in the blood. Ryan Cross, BostonGlobe.com, 28 June 2022 By the spring of 2019, her hemoglobin level was back to normal. Beth Bragg, Anchorage Daily News, 10 Sep. 2021 When chemotherapy during an arduous battle with leukemia destroyed much of her platelets and hemoglobin in 2019, transfusions helped replace the proteins needed to carry oxygen throughout her body. Abigail Hasebroock, Orlando Sentinel, 20 June 2022 In truth, the Teichmann Test had been in use since 1853, a conclusive test based on microcrystal formation in reaction to hemoglobin. Roy Schwartz, CNN, 20 May 2022 Donors receive a free mini-health screening with information on pulse, blood pressure and hemoglobin. Laura Groch, San Diego Union-Tribune, 13 Apr. 2022 See More Word History
Etymology
International Scientific Vocabulary, short for earlier hematoglobulin
First Known Use
1869, in the meaning defined at sense 1
Time Traveler
The first known use of hemoglobin was in 1869 Phrases Containing hemoglobin
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