Immunity Flashcards
what is immunity
a physiologic process that provides an individual w/ protection or defense from disease
what is innate immunity
1st line of defense
present at birth
nonspecific response
what is acquired immunity
specific response
active-results from formation of antibodies (b lymphocytes) and sensitized t lymphocytes
illness or vaccine
passive-results from introduction of preformed antibodies
what is suppressed immune system
immunocompromised
what is optimal immune response
normal and healthy
what is exaggerated immune response
autoimmune disorders
unable tp differentiate btwn host and foreign invader
examples of lymphoid organs
bone marrow
tonsils
adenoids
spleen
thymus
where do lymphoid stem cells start
bone marrow
where do lymphoid stem cells go to
thymus or bone marrow
what cells are produced by the thymus
immunocompetent t cells/ t lymphocytes
what are helper t cells
cd4 cells
stimulates rest of immune system to help w/ attack
what do regulatory t cells do
suppress immune response (protect against hyperactive immune response)
suppress fx of helper cytotoxic t cells and decrease b cell production
what do cytotoxic t cells/ killer t cells do
kill antigen directly
innate immunity
good @ killing cancer cells
stimulate apoptosis
CD 8 cells
what do memory t cells do
help w/ antigen recognition and help mount immune response
what do plasma cells secrete
anitbodies
what are b lymphocytes
produce antibodies
have memory
maturation in liver during mid fetal life, then in bone marrow
what is humoral
memory