The most prominent of these (and historically the first) is the representation theory of groups, in which elements of a group are represented by invertible matrices in such a way that the group operation is matrix multiplication.
hemoglobin is able to perform this function due to its ability to reversibly bind to oxygen. inside oxygen rich areas of the lungs, hemoglobin picks up oxygen molecules, then it transports the oxygen via red blood cells to bodys tissue, once hemoglobin reached the oxygen poor area of the tissues it releases the oxygen.
In humans, each red blood cell carries about 250,000 molecules of hemoglobin which can transport both oxygen and carbon dioxide. Hemoglobin is a molecule made of two separate components: the protein globin and the nonprotein heme groups. Heme belongs to a group of molecules classified as porphyrins.