Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Granulocytes are a type of white blood cell characterized by the presence of granules in their cytoplasm. They play crucial roles in the innate immune response by targeting and eliminating pathogens.
5 Must Know Facts For Your Next Test
Granulocytes include neutrophils, eosinophils, and basophils.
Neutrophils are the most abundant granulocytes and are often first to respond to infection.
Eosinophils combat multicellular parasites and are involved in allergic reactions.
Basophils release histamine during inflammatory responses and play a role in allergic reactions.
Granulocytes have a multi-lobed nucleus and contain enzymes that digest microorganisms.
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Related terms
Neutrophil: A type of granulocyte that is highly effective at phagocytosing bacteria.
Eosinophil: A type of granulocyte involved in combating parasitic infections and participating in allergic responses.
Basophil: A type of granulocyte that releases histamine during inflammatory responses and plays a role in allergic reactions.