Eosinophils are associated with which functions?

• A. Oxygen transport
• B. Inflammatory response, immunity, phagocytosis
• C. Blood clotting
• D. Hormone production

Answer: (B)

Eosinophils play a role in defending the body during inflammation and in immune responses, including helping to fight parasites. They release toxic granule contents and mediators that can damage parasites and shape the inflammatory environment, and they can take part in phagocytosing immune complexes and debris. This combination—contributing to the inflammatory response, participating in immunity, and engaging in phagocytosis—best fits what eosinophils do.

They are not involved in oxygen transport (that’s the job of red blood cells), not a primary player in blood clotting (that’s platelets and clotting factors), and not producers of hormones (hormones come from endocrine tissues). In clinical terms, higher eosinophil numbers often point to allergic conditions or parasitic infections, which aligns with their role in inflammation and immune modulation.