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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. In mammals, the chromoprotein makes up about 96% of the red blood cells' dry content (by weight), and around 35% of the total content (including water). A healthy individual human has 12 to 20 grams of hemoglobin in every 100 mL of blood. There it releases the oxygen to permit aerobic respiration to provide energy to power functions of an organism in the process called metabolism. lungs or gills) to the rest of the body ( i.e. Hemoglobin in blood carries oxygen from the respiratory organs ( e.g. Hemoglobin, ( haemoglobin BrE) (from the Greek word αἷμα, haîma 'blood' + Latin globus 'ball, sphere' + -in) ( / ˌ h iː m ə ˈ ɡ l oʊ b ɪ n, ˈ h ɛ m oʊ ˌ-/ ), abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in red blood cells (erythrocytes) of almost all vertebrates (the exception being the fish family Channichthyidae) as well as the tissues of some invertebrates. α and β subunits are in red and blue, respectively, and the iron-containing heme groups in green. 6 Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland.Structure of human hemoglobin. 5 Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland. 4 Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland. 3 Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland. 2 Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland. 1 Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland.

6 Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland.