A&P 2 (Unit 4: T lymphocytes)

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23 Terms

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Cytotoxic T cells (Tc)
T cells that carry out attack on foreign cells
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Helper T cells can also be called
CD4 cells
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cytotoxic T cells can also be celled
CD8 cells
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Helper T cells/ CD8 cells
Promote action of t cells and have key roles in humoral and innate immunity
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What do Helper T cells do in humoral immunity
Turn off B lymphocytes
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Regulatory T cells can also be called
TR cells
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What is the function of Regulatory T cells?
Limit immune response
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How do Regulatory T cells inhibit the immune response?
By inhibiting multiplication of cytotoxic T cells and others
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When do Regulatory T cells become active?
After a pathogen is defeated
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What T cell prevents autoimmune diseases
Regulatory T cells
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Cellular immunity
immune response that relies on T cells to destroy infected body cells
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Humoral immunity
specific immunity produced by B cells that produce antibodies that circulate in body fluids
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Antigen presenting cells

macrophages, dendritic cells, B cells, reticular cells

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Where T cells mature
Thymus
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Where T cells are made
Bone marrow
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What does MHC stand for?
Major Histocompatibility Complex
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What is the function of MHC proteins?
They help display antigens to T cells.
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Where is MHC I found?
On all cells.
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What does MHC I display?
Bits of proteins from within the cell.
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What happens if abnormal peptides are displayed by MHC I?
The cell is destroyed by killer T cells.
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Where is MHC II found?
Only on macrophages and B cells.
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What are antigen presenting cells?
Cells that display bits of 'eaten' proteins using MHC II.
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What is the role of MHC II in the immune response?
It allows the activation of helper T cells.