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How do granulocytes help the body respond to infection and inflammation?
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white blood cell
Blood is made up of multiple components, including red blood cells, white blood cells, platelets, and water-rich plasma.
Granulocytes are essential components of the innate immune system that help the body respond to infection and inflammation through mobility, phagocytosis, and the release of specialized chemicals. They are attracted to sites of injury or infection by chemotaxis—a process where they follow chemical signals released by damaged tissues or invading microorganisms.1234
The three types of granulocytes contribute to these responses in distinct ways:
- Neutrophils: As the most numerous granulocytes, they are often the first to arrive at an infection site. They use amoeboid motion to reach the area and perform phagocytosis, engulfing and destroying bacteria and other particles using potent enzymes and reactive oxygen species stored in their granules.234
- Eosinophils: These cells are particularly effective at attacking larger parasites and help modulate inflammatory responses, often dampening their potentially destructive effects.523
- Basophils: These cells release substances such as histamine and heparin, which play significant roles in allergic inflammatory reactions.23
Because granulocytes have a short life span, the bone marrow maintains a reserve to be mobilized rapidly during times of infection or inflammation.14