In the immune system, which antibody primarily functions to neutralize pathogens and toxins?

The selected answer, IgG, is indeed the antibody that plays a significant role in neutralizing pathogens and toxins in the immune system.

IgG is the most abundant antibody in the bloodstream and is crucial for the immune response. It functions primarily by recognizing and binding to specific antigens on pathogens, such as bacteria and viruses, effectively neutralizing them and preventing them from infecting or damaging cells. This antibody type can also opsonize pathogens, marking them for destruction by other immune cells, and is involved in activating the complement system, further enhancing the immune response.

Moreover, IgG is the only antibody that can cross the placenta, providing passive immunity to the fetus and newborn. Its ability to efficiently neutralize a wide array of pathogens makes it a vital component of the adaptive immune response.

In contrast, while other antibodies like IgE are associated with allergic reactions, IgA is primarily found in mucosal areas (like the gut and respiratory tract) and is involved in mucosal immunity, and IgM is the first antibody produced in response to an infection but is not as effective for neutralization compared to IgG. Each antibody class has specific functions and plays distinct roles in the broader immune system, but IgG's key role in neutralizing