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42 terms

White Blood Cells

White blood cells are WBC in this quizlet
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leukocytes
white blood cells are also called this
WBC
the only formed elements in blood that are complete cells (have nuclei)
leukopoiesis
the production of WBCs
leukocytes
nucleated cells and do not contain hemoglobin
granular, agranular
two principle types of WBC
eosinophils, basophils, neutrophils
three different types of granular leukocytes
agranular
monocytes and lymphocytes fall under this category
diapedisis
WBC emigrate between cells lining walls of capillaries by this process
5000-10000
number of cells per drop of blood
leukocytosis
high white blood cell count
microbes, anesthesia, surgery
list a few causes of high WBC count
leukopenia
low white blood cell count
radiation, shock, chemotherapy
list a few causes of low WBC count
2
what percent of the total WBC population is in circulation?
lymphatic fluid, skin, lungs, lymph nodes, spleen
list a few places where the majority of WBC reside
differential WBC count
detection of changes in numbers of circulating WBC
infection type, infection
what does differential WBC count indicate?
emigration
WBC leave the blood stream via _______________
phagocytosis
some WBCs are active in ____________________
neutrophils, macrophages
which WBCs are particularily active in phagocytosis?
chemotaxis
the chemical attraction of WBCs to a disease or injury site is _______________
neutrophils
a granulocyte with 2 to 5 lobes and fine, pale lilac granules
60-70
percentage of neutrophils found in circulating WBCs
neutrophils
fast response action to bacteria, release lysozymes, defensin and oxidants
eosinophils
granulocytes with 2 to 3 lobes; is roughly 2 to 4 percent of circulating WBCs
eosinophils
these release histaminase and attacks parasite worms
basophils
large, dark purple granular granulocyte that is less than one percent of circulating WBCs
basophils
involved in inflammatory and allergy reactions
basophils
these release heparin, histamine, and serotonin
lymphocyte
agranulocyte that has a dark oval nucleus; increase in number due to viral infections
20-25
percentage of lymphocytes in WBCs
B cells
destroy bacteria and their toxins
T cells
attack viruses, fungi, transplanted organs, cancer cells, and bacteria
Natural killers
attack many different microbes and some tumor cells
monocyte
nucleus is kidney-shaped; largest WBC in circulation
3-8
percentage of monocytes within in the blood stream
monocytes
these become wandering macrophages and destroy microbes, cleaning up dead tissue found in an infection
myeloid stem cells
these develop into a megakaryocyte
megakaryocyte
splinters into 2000-3000 fragments
platelets
also called thrombocytes
nucleus
platelets contain NO _________
5-9
how many days do platelets typically last?