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a protein produced by certain white blood cells that regulates immune responses by activating lymphocytes and initiating fever
a nonliving, infectious particle composed of a nucleic acid and a protein coat; it can invade and destroy a cell
the third line of defense. the body's way of fighting off specific things that invade your body
helper T cell
a type of lymphocyte that works with B cells to increase antibody production by plasma cells, and stimulates the proliferation of both T cells and B cells
Nonspecific defensive response of the body to tissue injury, including dilation of blood vessels
natural killer cells
A type of white blood cell that can kill tumor cells and virus-infected cells; an important component of innate immunity.
killer T cells
look for infected cells and kill them (your own cells that are infected) to prevent the spread of pathogens
A weakened or inactive version of a pathogen that stimulates the body's production of antibodies which can aid in destroying the pathogen
memory B cells
cells in your immune system that remember how to make an antibody for a particular pathogen
major histocompatibility complex; found in the plasma membrane; alerts T cells that a cell is infected w/ a virus
an immunity resulting from antibodies that are conveyed naturally through the placenta to a fetus or artificially by injection of a serum containing antibodies
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