19.4 Formed elemenets (leukocytes) Flashcards
what is the fn of WBCs?
protect body against microorganisms and remove dead cells and debris
what type of movement do most WBCs exhibit?
ameboid
describe ameboid movement
the ability to move like an ameba, by putting out irregular cytoplasmic projections
what is diapedesis?
the WBCs become thin and elongated and move either between or through the endothelial cells of the capillary walls
when does a WBC use diapedesis?
when it leaves the circulation to enter tissues
what is the attraction to and movement toward foreign materials or damaged cells called?
chemotaxis
what is pus?
the accumulation of dead WBCs and bacteria
what is the most common type of WBC?
neutrophil
what type of WBC is a neutrophil?
granulocyte
what name is given to a neutrophil to describe its nuclei that are multilobed and can occur in more than one form?
polymorphonuclear neutrophil or PMN
how long does a neutrophil remain in circulation?
10-12 hours
what type of materials are usually phagocytized by neutrophils?
bacteria, antigen-antibody complexes, other foreign matter
what type of cell is most likely to phgocytize bacteria, antigen-antibody complexes, other foreign matter
WBC, neutrophil
what is a lysozyme?
an enzyme from a lysosome to destroy bacteria
what type of cell is most likely to secrete lysozymes?
WBC, neutrophil
how long do neutrophils survive after they leave the circulation?
1-2 days
what type of WBC is an eosinophil?
granulocyte
how does an eisinophil respond to inflammation?
leaves circulation
minimize inflammation by secreting a chemical that destroys histamines
what is the fn of an eisinophil?
minimize inflammation
use toxic chemicals to attack parasitic infections
what type of parasites are eisinophils likely to attack?
hookworms, tapeworms, flatworms
what type of WBC is the least common?
Basophil
what type of WBC is the most common?
neutrophil
what type of WBC is a basophil?
granulocyte
what WBCs are granulocytes?
neutrophils
eosinophils
basophils
