White Blood Cells

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White blood cells are WBC in this quizlet

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?

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