Связывание и высвобождение в определенных участках, иллюстрирующее важнейшее. Diagram of a red blood cell detailing the structure of hemoglobin. Four hemoglobin molecules, labeled? and? , are depicted with polypeptide chains. Iron atoms (Fe²? ) in heme groups bind oxygen molecules (O? ), facilitating oxygen transport and release. The image highlights oxygen binding and release at specific sites, illustrating the crucial role of iron in oxygen transport within the bloodstream.