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.
1) In the blood, oxygen is carried by the red blood cells as oxyhemoglobin (this is just oxygen bonded to hemoglobin). 2) At the body cells, this oxygen leaves the hemoglobin by easily diffusing through the capillaries. 3) The cells can now carry out cellular aerobic respiration at the mitochondria for energy.