Blood cells: RBCs, Platelets & Leukocytes

Types of White Blood Cells​ 


There are two main types of leukocytes— granulocytes 
and agranulocytes— cells of the human immune system differentiated based on their appearance when stained and viewed through a microscope.

Article Summary: White blood cells, known as leukocytes, are the immune system's security force, working to protect the body from invasion. Here are the different kinds of WBCs.
Types of White Blood Cells (Leukocytes)

Eosinophil Granulocyte White Blood Cell
Neutrophil Granulocyte White Blood Cell
Basophil Granulocyte White Blood Cell
Instructor's Corner
There are three types of granulocytes:
  •   eosoinophils
  •   neutrophils
  •   basophils

​Eosinophils are granulocytes identified using the dye eosin, with granules staining a red to orange hue. This type of white blood cell is a phagocyte, meaning that, like an amoebae, the cell can extend pseudopods, enclosing, engulfing and digesting pathogens, similar to a Pac Man eating ghosts. Eosinophs are also involved in fighting parasitic worm (nemoatode) infection.

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Granulocyte White Blood Cells
Granulocytes have granules present throughout their cytoplasm. When these cells are stained to be viewed through the microscope, these granules look like their small dots scattered throughout the cell. 
Basophils, the least common granulocyte, stain blue with the use of methylene blue dye. These granulocytes, along with mast cells, release histamine, a chemical that stimulates vasodilation (expansion of blood vessels) and elements of allergic response, such as mucous secretion and itching.

Neutrophils are large granulocytes that stain lilac with a combination of basic and acidic dyes. Neutrophils are "first responders" to inflammation and contribute to pus being white. Like eosinophils, these granulocytes are able to phagocytize invading pathogens.

Neutrophil leukocyte illustration
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​Page last updated: 8/2015