Though strictly speaking, an antibody is not the same as an immunoglobulin; B cells can produce two types of immunoglobulins-surface immunoglobulins, which are B cell receptors; and secreted immunoglobulins, which are antibodies. So antibodies are one of two classes of immunoglobulins.ach antibody binds to a specific antigen; an interaction similar to a lock and key. An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses.
About 95 percent of the dry weight of the red blood cell consists of hemoglobin, the substance necessary for oxygen transport. Hemoglobin is a protein; a molecule contains four polypeptide chains (a tetramer), each chain consisting of more than 140 amino acids.
Hemoglobin is a protein formed of two subunits (alpha and beta) that is found in red blood cells. The protein functions to pick up oxygen and distribute it throughout the body. Both the alpha and beta subunits need to be present for the acquisition of oxygen, as does an iron molecule. Indeed, it is the presence of the iron that gives red blood cells the distinctive color that inspired their name. The presence of iron enables hemoglobin to alternatively bind oxygen and carbon dioxide.