Lymphatic System Flashcards
What is an abscess?
A swollen area in the body containing an accumulation of pus.
Where do T cell originate? What must they do to become activated?
From red bone marrow. They must go to the thymus to become active.
What are cytotoxic T-cells?
Lymphocytes involved in cell-mediated immunity that kill target cells by direct contact or by the secretion of lymphotoxins; also called killer T cells and TC cells
What do helper T-cells do?
They stimulate the responses of both T cells and B cells.
Why are helper T-cells important?
They must activate B cells before the B cells can produce antibodies.
What are regulatory T-cells?
Population of T lymphocytes that suppress the immune response.
What are memory T-cells?
T lymphocytes that provide immunologic memory, enabling an enhanced immune response when reexposed to a specific antigen.
What do B-cells divide into? (2)
- Plasma cells. 2. Memory B-cells.
What do plasma cells do?
Activated B cells that secrete antibodies.
What kind of immunity do B-cells provide?
Antibody-mediated immunity.
What are immunoglobulins?
Circulating antibodies.
What kind of immunity do T cells provide?
Cell-mediated immunity.
What do NK cells do?
They attack foreign cells, normal cells infected with viruses, and cancer cells that appear in normal tissues.
What is immune surveillance?
The constant monitoring of peripheral tissues by NK cells and cytotoxic T cells.
What is mucosa-associated lymphoid tissue (MALT)?
The extensive collection of lymphoid tissues linked with the epithelia of the digestive, respiratory, urinary, and reproductive tracts.
