Immunoglobulins

Immunoglobulins (Ig) are antibodies produced by plasma cells that play a critical role in the immune response. They can recognize and bind to specific antigens, such as bacteria and viruses. There are five main classes of immunoglobulins in humans:

  1. IgG: The most abundant antibody, important for long-term immunity.

  2. IgA: Found in mucosal areas, such as the gut and respiratory tract, as well as in saliva and breast milk.

  3. IgM: The first antibody produced in response to an infection, important for initial immune response.

  4. IgE: Involved in allergic reactions and responses to parasitic infections.

  5. IgD: Functions mainly as a receptor on B cells that have not been exposed to antigens.

Study Guide for Immunoglobulins (Antibodies)

Definition:Immunoglobulins (Ig) are antibodies produced by plasma cells that play a critical role in the immune response. They can recognize and bind to specific antigens, such as bacteria and viruses.

Classes of Immunoglobulins:

  1. IgG:

    • The most abundant antibody.

    • Important for long-term immunity.

  2. IgA:

    • Found in mucosal areas (gut, respiratory tract), saliva, and breast milk.

  3. IgM:

    • The first antibody produced in response to an infection.

    • Important for the initial immune response.

  4. IgE:

    • Involved in allergic reactions and responses to parasitic infections.

  5. IgD:

    • Functions mainly as a receptor on B cells that have not been exposed to antigens.