What is the main function of antibodies in the adaptive immune system?

The main function of antibodies in the adaptive immune system is to bind antigens for destruction. Antibodies, also known as immunoglobulins, are specialized proteins produced by B cells in response to specific pathogens or foreign substances (antigens). When antibodies recognize and bind to their corresponding antigens, they help neutralize or mark these foreign invaders for destruction by other components of the immune system, such as phagocytes and the complement system. This process is crucial for effective immune responses and helps the body eliminate infections.

The other choices do not accurately reflect the primary role of antibodies. While hormones play a role in regulatory functions in the body, they are not related to the immune response like antibodies. The transport of nutrients is a function associated with the circulatory or digestive systems, rather than the immune system. Structural support is primarily provided by proteins such as collagen and keratin in tissues, not by antibodies. Thus, the correct answer emphasizes the critical role of antibodies in identifying and addressing pathogens in the adaptive immune response.