Test viscosity of hemoglobin in rbc1/21/2024 ![]() ![]() It carries off some of the body's respiratory carbon dioxide (about 20–25% of the total) as carbaminohemoglobin, in which CO 2 binds to the heme protein. The mammalian hemoglobin molecule can bind and transport up to four oxygen molecules. Hemoglobin has an oxygen-binding capacity of 1.34 mL O 2 per gram, which increases the total blood oxygen capacity seventy-fold compared to dissolved oxygen in blood plasma alone. In mammals, hemoglobin makes up about 96% of a red blood cell's weight excluding water, and around 35% of the total weight including water. Hemoglobin is a metalloprotein and chromoprotein. ![]() A healthy human has 12 to 20 grams of hemoglobin in every 100 mL of blood. Hemoglobin in blood carries oxygen from the respiratory organs ( lungs or gills) to the other tissues of the body, where it releases the oxygen to enable aerobic respiration which powers the animal's metabolism. ![]() Hemoglobin ( also spelled haemoglobin, abbreviated Hb or Hgb), is the iron-containing oxygen-transport protein present in red blood cells (erythrocytes) of almost all vertebrates (the exception being the fish family Channichthyidae) as well as the tissues of some invertebrate animals. α and β globin subunits are in red and blue, respectively, and the iron-containing heme groups in green. ![]()
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