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HomeHomework HelpbiologyT cells and Immunity

T cells and Immunity

T cells are a type of white blood cell that play a crucial role in the immune response by recognizing and responding to specific antigens, primarily through cell-mediated immunity, which involves the direct killing of infected or cancerous cells and the activation of other immune cells. Cell-mediated immunity is the immune response that does not involve antibodies but relies on the actions of T cells to eliminate pathogens and infected cells.

intermediate
2 hours
Biology
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T cells are a vital component of the immune system, responsible for identifying and eliminating infected or cancerous cells. They play a key role in cell-mediated immunity, which is essential for protecting the body against various pathogens. T cells can be categorized into different types, includin...

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Key Terms

T Cell
A type of white blood cell that plays a central role in cell-mediated immunity.

Example: Cytotoxic T cells kill infected cells.

Antigen
A substance that triggers an immune response, often found on the surface of pathogens.

Example: Bacterial proteins can act as antigens.

Antigen-Presenting Cell
Cells that display antigens to T cells, initiating their activation.

Example: Dendritic cells are key antigen-presenting cells.

Cytokines
Proteins released by cells that affect the behavior of other cells in the immune response.

Example: Interleukins are a type of cytokine.

Cytotoxic T Cell
A subtype of T cell that directly kills infected or cancerous cells.

Example: CD8+ T cells are cytotoxic T cells.

Helper T Cell
A subtype of T cell that helps activate other immune cells.

Example: CD4+ T cells are helper T cells.

Related Topics

B Cells and Humoral Immunity
B cells are another type of white blood cell that produce antibodies, playing a key role in humoral immunity.
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Vaccination and Immune Response
Understanding how vaccines work to stimulate an immune response is crucial for public health.
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Autoimmune Diseases
Study how the immune system can mistakenly attack the body's own cells, leading to autoimmune diseases.
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Key Concepts

T cell typesActivation processRole in immunityMemory T cells