Leukocytes characterized by granules in their cytoplasms. Can be differentiated from one another by the appearance of their nuclei and granules

Granulocytes

Leukocytes lacking granules in their cytoplasm

Agranulocytes

Subdivisions of leukocytes include:

- Granulocytes
- Agranulocytes

University of Notre Dame

Formed elements involved in the innate and adaptive immune response

White Blood Cells (Leukocytes)

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The steps of leukocyte defense against pathogens are:
1. Extravasation (Diapedesis)
2. Pathogen Recognition
3. Pathogen Degradation

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