The US is considered a terrorist regime outside the United States. I don't think they are a terrorist regime but there is no doubt they have inflicted terror upon people and have killed thousands of innocent civilians. Source(s): aliasasim Â· 9 years ago.
Hemoglobin consists of four subunits, each with a cofactor called a heme group that has an iron atom center. The iron is the main component that actually binds to oxygen, thus each hemoglobin molecule is able to carry four molecules of O 2.
Erythrocytes consist mainly of hemoglobin, a complex metalloprotein containing heme groups whose iron atoms temporarily bind to oxygen molecules (O 2) in the lungs or gills and release them throughout the body. Oxygen can easily diffuse through the red blood cell's cell membrane.he blood's red color is due to the spectral properties of the hemic iron ions in hemoglobin. Each human red blood cell contains approximately 270 million of these hemoglobin biomolecules, each carrying four heme groups; hemoglobin comprises about a third of the total cell volume.