Types Of Adaptive Immune Responses

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.


Responding lymphocytes

Effector mechanism

Transferred by


Humoral immunity

Extracellular microbes

B lymphocyte

B lymphocyte

Secreted antibody

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