Final answer:
The humoral immune response involves B cells producing antibodies to fight off pathogens in the blood and lymph.
Explanation:
Humoral immune response is the main type of immune response elicited by an inactivated (killed) pathogen. It involves B cells producing antibodies that circulate in the blood and lymph to fight off pathogens. Antibodies, also known as immunoglobulins, play a crucial role in recognizing and binding to antigens.
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