Immune System Flashcards
White blood cells
Leukocytes
WBC are produced from
hematopoietic stem cells
Triggered by ___
interleukins + colony - stimulation factors in response to infection
Granulocytes
contain cytoplasmic granules
Neutrophils
phagocyte that defense against bacterial infection
Polymorphonuclear
multi-lobed nucleus connected w/ thin strands of chromatin (3-5 segments normal)
Neutrophils make up
54-62% of circulating WBC
Eosinophils
defend against parasitic worms
Basophils
defend against ectoparasites
Histamines are released for ___
inflammation
Hepain is released to ___
inhibit blood clotting
Agranulocytes
WBC do not contain cytoplasmic granules
Monocytes
change into macrophages to destroy bacteria by phagocytosis
Largest WBC
monocytes
Lymphocytes
main WBC found in lymph (25-35% of circulating WBC)
Lymphocytes are ___
Natural Killer (NK) cells
NK cells do __?
Induce apoptosis
Kill infected or cancerous cells
T lymphocytes
cellular immune response, direct cell-to-cell action
Antigen
surface shape recognized by immune system
Helper T cell
activates B cells for antibody production, release chemical to stimulate WBC production
Cytotoxic T cell
assassin cell - destroy infected cells with particular antigen
Memory T cell
long lived cells that patrol for future exposure to that antigen
B lymphocytes
humoral immune response, circulating protection in the blood
Plasma cells
secret antibodies (immunoglobulins)
Memory B cells
long-lived B cells that patrol for future exposure to antigen
platelets
thrombocytes
Megakaryocytic cell
breaks apart into smaller pieces called platelets
