White Blood Cells Flashcards
Characteristics of leukocytes
- has nuclei and organelles, no hemoglobin
- all can migrate out of the bloodstream
- all are capable of amoebid movement
- all are attracted to specific stimuli
Diapedesis definition
process of leukocytes squeezing into tissues that need them
Amoebid movement definition
gliding motion along blood vessel line and tissues
Leukocyte function
defend body against invasion, removes toxins, wastes, and abnormal cells
Types of leukocytes
neutrophils, eosinophils, basophils, monocytes, lymphocytes
Types of lymphocytes
T cells, B cells, natural killer cells
Mnemonic for order of lympocytes most to least common
Never; most common; neutrophils
Let; lymphocytes
Monkeys; monocyte
Eat; eosinophils
Bananas; least common; basophils
Neutrophil characteristic, function and prevalence
characteristic: cytoplasm full of lysosomal enzymes and bacterial compounds
function: attack and digest bacteria marked by antibodies; promotes inflammation and attracts other WBCs
prevalence: most common; 50-70% of WBC
Eosinophil characteristic, function and prevalence
characteristic: pink due to eosin dye
function: attack objects coated in antibodies; helps reduce inflammation; exocytosis of toxic compounds
Basophil characteristic, function and prevalence
characteristic: small; accumulates in damaged tissues
function: discharge histamine, heparin to enhance inflammation; attracts other WBCs
prevalence: rare
Monocyte characteristic, function and prevalence
characteristic: largest; kidney bean shaped nucleus
function: enters tissues to become macrophage; release chemicals to recruit other WBCs
prevalence:
Lymphocyte characteristic, function and prevalence
characteristic: very large nucleus, contains T cells, B cells, and natural killer cells
function: T cell; attack foreign cells or control other lymphocytes
B cell; production of antibodies via plasma cells, binds to antigens
natural killer cells; detects and kills abnormal cells
prevalence: most in connective tissue; lymphatic organs
What is differential count?
amount of leukocytes found in a smear
Leukopenia definition
not enough leukocytes
Leukocytosis definition
too many leukocytes
Describe leukopoiesis
production of leukocytes
Where does leukopoiesis occur
red bone marrow
