Which immunity is mediated by secreted antibodies, complement proteins, and antimicrobial peptides in body fluids?

Humoral immunity is characterized by the production of antibodies that are secreted into body fluids, such as blood and lymph. These antibodies are specifically designed to recognize and bind to antigens, which are harmful substances like pathogens or toxins. The binding of antibodies to antigens can neutralize pathogens, mark them for destruction by other immune cells, or activate complement proteins that help to further enhance the immune response. Additionally, antimicrobial peptides present in body fluids also contribute to the defense against infections by directly targeting and destroying microorganisms.

This type of immunity is distinguished from cell-mediated immunity, which primarily involves T cells and does not rely on antibodies. While passive immunity involves the transfer of antibodies from one individual to another, such as from mother to child through breast milk, it is not characterized by the individual's own immune response to pathogens. Specific immunity is a broader term that encompasses both humoral and cell-mediated immunity, but when the question specifically asks about antibodies, complement proteins, and antimicrobial peptides in body fluids, humoral immunity is the most accurate descriptor.