B. IgE – Explanation
Whilst the majority of IgA is found in secretions there is a significant quantity present in blood. IgE
makes up less than 0.1% of immunoglobulins
Immunoglobulins
The table below summarizes the characteristics of the 5 types of immunoglobulin found in the body:
| IgG | 75% | Monomer | Enhance phagocytosis of bacteria and viruses, pass to fetal circulation |
| IgA | 15% | Monomer/Dimer | Found in secretions, provide localized protection on mucous membranes |
| IgM | 10% | Pentamer | First to be secreted, anti-A, B blood antibodies |
| IgD | 1% | Monomer | Involved in activation of B cells |
| IgE | 0.1% | Monomer | Involved in allergic reactions |
