Final answer:
There are five different classes of antibodies found in humans: IgM, IgD, IgG, IgA, and IgE. Each class has specific functions in the immune response.
Step-by-step explanation:
There are five different classes of antibodies found in humans: IgM, IgD, IgG, IgA, and IgE. Each of these classes has specific functions in the immune response.
IgM is the largest antibody and is usually the first antibody made during a primary immune response. IgG is the most abundant antibody and is involved in long-term immunity.
IgA is found in body secretions like tears, saliva, and breast milk. IgD is involved in the activation of B cells. IgE is responsible for allergic responses.