Scelta multipla
Which type of immunity mainly involves the action of B cells?
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21. The Immune System
Introduction to Adaptive Immunity
Scelta multipla
What type of immunity uses helper cells and killer cells to identify and destroy abnormal cells?
A
Humoral immunity
B
Passive immunity
C
Cell-mediated immunity
D
Innate immunity
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Begin by understanding the different types of immunity: Humoral immunity involves antibodies produced by B cells, passive immunity is acquired through external sources like maternal antibodies, innate immunity is the body's first line of defense, and cell-mediated immunity involves T cells.
Focus on cell-mediated immunity, which is a type of adaptive immunity that does not involve antibodies but rather the activation of phagocytes, antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen.
Identify the key components of cell-mediated immunity: Helper T cells (CD4+ cells) and cytotoxic T cells (CD8+ cells). Helper T cells assist other cells in the immune response, while cytotoxic T cells directly attack and destroy infected or abnormal cells.
Understand the role of helper T cells: They recognize antigens presented by antigen-presenting cells and release cytokines that stimulate the activity of other immune cells, including cytotoxic T cells.
Recognize the function of cytotoxic T cells: They identify and destroy cells that display abnormal antigens, such as virus-infected cells or cancer cells, by inducing apoptosis (programmed cell death).
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