What are the primary types of antibodies found in the immune system?

The primary types of antibodies in the immune system are indeed IgG, IgA, IgM, IgE, and IgD.

Each of these antibodies plays a distinct role in the immune response:

• IgG is the most abundant antibody in serum and is crucial for long-term immunity and secondary immune responses. It can opsonize pathogens for phagocytosis and neutralize toxins and viruses.

• IgA is primarily found in mucosal areas such as the gut, respiratory tract, and in secretions like saliva and breast milk, providing critical protection at mucosal surfaces.

• IgM is the first antibody produced in response to an infection, playing a key role in the initial stages of the immune response. It can efficiently bind to multiple antigens and activate complement pathways.

• IgE is involved in allergic reactions and responses to parasitic infections. It binds to allergens and triggers histamine release from mast cells and basophils.

• IgD is present in small amounts in the serum and is mainly found on the surface of B cells, playing a role in the initiation of B cell activation.

The options presented contain variations in antibody types that do not accurately reflect the known classes of antibodies, making option B the correct response. Understanding