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Leukocytes
White blood cells that defend against pathogens.
Basophil
Rare granulocyte (<0.5%); secretes histamine for vasodilation.
Neutrophil
Most abundant granulocyte (60-70%); phagocytizes bacteria.
Eosinophil
2-4% of leukocytes; targets allergens and parasites.
Lymphocyte
Second most abundant (25-33%); involved in immune response.
Monocyte
Largest leukocyte (3-8%); differentiates into macrophages.
Phagocytize
Process of engulfing and destroying pathogens.
Basiophil
Neutrophil
Eosinophil
Lymphocytes
Monocyte