There are two types of adaptive immune responses, called humoral immunity and cell-mediated immunity, that are
FIGURE 1-2 Types of adaptive immunity. In humoral immunity, B lymphocytes secrete antibodies that prevent infections by and eliminate extracellular microbes. In cell-mediated immunity, helper T lymphocytes activate macrophages to kill phagocytosed microbes or cytotoxic T lymphocytes directly destroy infected cells.
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